Within a period, what happens to the atomic radius as the atomic number increases?

Answers

Answer 1
Hello))
in periods the atomic radius decreases
Answer 2

In a period, the atomic radius decreases as the atomic number increases because the effective nuclear charge increases from left to right in a period.

What is the atomic radius?

The atomic radius of an atom of an element can be described as the shortest distance between the center of the nucleus of the atom and the valence shell of the atom. An atomic radius can also be described as half the distance between two atoms of an element that are bonded together.

In general, the atomic radius of an atom decreases as we move from left to right in a period because while moving from left to right in a period, there is an increase in the effective nuclear charge of an atom. In periods, the electrons enter the same outermost shell.

In a group from top to bottom, the atomic radius of the atom increases because of the addition of a new principle shell.

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Related Questions

how many moles are in a pill containing 37.0mg of C12H22FeO14

Answers

From the periodic table:
mass of carbon = 12 grams
mass of hydrogen = 1 gram
mass of iron = 55.84 grams
mass of oxygen = 16 grams
Therefore:
molar mass of C12H22FeO14 = 12(12) + 22(1) + 55.84 + 14(16) = 445.84 grams

number of moles = mass / molar mass
number of moles = 0.037 / 445.84 = 82.989 x 10^-6 moles
8.29 x 10^-5 moles. First lookup the atomic weights of all involved elements. Atomic weight carbon = 12.0107 Atomic weight hydrogen = 1.00794 Atomic weight iron = 55.845 Atomic weight oxygen = 15.999 Now calculate the molar mass 12 * 12.0107 + 22 * 1.00794 + 55.845 + 14 * 15.999 = 446.13408 g/mol Finally divide the mass by the molar mass to get the number of moles. Remember to convert the mass to grams. .0370 g / 446.13408 g/mol = 0.0000829347 moles Since 0.0000829347 is a rather inconvenient number to deal with, convert to scientific notation and round to 3 significant figures since that's the precision of the data we have. So the answer is: 8.29 x 10^-5 moles.

When a cell is placed in this type of solution, equal amounts of water enter and leave the cell?

Answers

The answer is Isotonic

The mercury content of a stream was believed to be above the minimum considered safe—1 part per billion (ppb) by weight. an analysis indicated that the concentration was 0.68 parts per billion. what quantity of mercury in grams was present in 15.0 l of the water, the density of which is 0.998 g/ml? (1 ppb hg = 1 ng hg ) 1 g water

Answers

Answer:

Amount of mercury is 1.0*10⁻⁵ g

Explanation:

Given:

Mercury content of stream = 0.68 ppb

volume of water = 15.0 L

Density of water = 0.998 g/L

To determine:

Amount of mercury in 15.0 L of water

Calculation:

[tex]1 ppb = \frac{1\mu g(solute)}{1L(solvent)}[/tex]

where 1 μg (micro gram) = 10⁻⁶ g

0.68 ppm implies that there is 0.68 *10⁻⁶ g mercury per Liter of water

Therefore, the amount of mercury in 15.0 L water would be:

[tex]=\frac{0.68*10^{-6}g\ Hg* 15.0\ L\ water}{1\ L\ water} =1.02*10^{-5}g[/tex]

How many moles of lif are contained in 258.6 ml of 0.0296 m lif solution?

Answers

Final answer:

We determine the moles of LiF in the given solution by first converting the volume from mL to L and then using the molarity formula. This gives us the moles of LiF in the 258.6 mL solution.

Explanation:

The question is asking us to calculate the moles of LiF (Lithium fluoride) present in a specific volume of 0.0296 M solution. To do this, we can use the molarity equation, where molarity is defined as moles of solute per liter of solution.

Before applying the equation, we need to convert the volume of the solution from milliliters (mL) to liters (L). We know 1 L = 1000 mL, therefore 258.6 mL = 258.6/1000 L = 0.2586 L.

After conversion, we plug the values into the molarity equation which is Moles = Molarity x Volume, giving us Moles = 0.0296 M x 0.2586 L. When this product is calculated, we get the moles of LiF present in the 258.6 mL solution.

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What is having too many or too few electrons?

Answers

When an object has either too many or too few electrons it is electrically charged.

How many atoms are in 131.97 liters of water vapor at STP?

A) 6.023 × 1023

B) 3.54846 × 1024

C) 3.548 × 1024

D) 1.0645 × 1025

Answers

There is
A) 6.023×1023 athoms

There are 1.0645 × 10²⁵ atoms in 131.97 liters of water vapor at STP. This is calculated by finding the number of moles in that volume of water vapor and then multiplying by Avogadro's number and the number of atoms per molecule of water.

To determine how many atoms are in 131.97 liters of water vapor at standard temperature and pressure (STP), we must recall that at STP, one mole of an ideal gas occupies 22.4 liters. Given that one mole of water (H₂O) contains 6.022 × 10²³ molecules (Avogadro's number), we first need to find out how many moles of water vapor are present in 131.97 liters.

Using the volume of one mole at STP, we calculate the number of moles in 131.97 liters:

Moles of H₂O = (131.97 L) / (22.4 L/mol) = 5.89 mol (approximately)

Now, each molecule of water contains 3 atoms (2 hydrogen atoms and 1 oxygen atom). Therefore, we need to calculate the total number of atoms:

Total atoms = 5.89 mol × 6.022 × 10²³ molecules/mol × 3 atoms/molecule

Total atoms = (5.89 × 6.022 × 10²³ × 3) atoms

After performing the multiplication, we get:

Total atoms = 1.0645 × 10²⁵ atoms

The correct answer is D) 1.0645 × 10²⁵.

when a neutral atom loses an electron to ionize and become a cation, it also loses its outermost orbital
true or false

Answers

It's false..because for example we have some metals that they can have two,three or more type of ions.

Is food rotting a chemical change physical change physical property or a chemical property?

Answers

Food rotting is a CHEMICAL CHANGE 

Compare the two atoms: 188 'X' and 178 'Y'. How are these atoms related?:

a. They are atoms of different elements

b. They have the same number of neutrons

c.They have different numbers of protons

d. They are isotopes of the same element

Answers

They are isotopes of the same element

Rainwater has a ph below 7 because raindrops absorb co2 which can react with water to form carbonic acid.

Answers

This statement is true. Pure water has a neutral pH of 7. However, the atmosphere is a mixture of gases, which includes carbon dioxide among others. When it interacts with carbon dioxide, this reaction occurs:

H₂O + CO₂ → H₂CO₃

The product is carbonic acid which is a weak acid. Because the pH of an acid is below 7, the rain would also have a pH below 7.

List the earth names for the 30 alien elements

Answers

technetium -- Tc -- element 43prometheum -- Pm -- element 61{polonium -- Po ---- element 87{radium -- Ra -- element 88}{actinium --Ac -- element 89}{protactinium -- Pa -- element 91}neptunium -- Np -- element 93plutonium --Pu -- element 94americium -- Am -- element 95curium -- Cm -- element 96berkelium-- Bk -- element 97californium -- Cf -- element 98einsteinium -- Es -- element 99fermium -- Fm -- element 100mendelevium -- Mv -- element 101nobelium -- No --element 102lawrencium -- Lr -- element 103 (originally the symbol for this element was Lw)rutherfordium -- Rf -- element 104dubnium -- Db -- element 105seaborgium -- Sg -- element 106bohrium -- Bh -- element 107hassium -- Hs --element 108meitnerium -- Mt -- element 109darmstadtium -- Ds -- element 110roentgenium -- Rg -- element 111copernicium -- Cn -- element 112flerovium --Fl -- element 114livermorium -- Lv -- element 116These are the "English names" rather than the "earth names".The elements in braces {} do not necessarily count as "alien" because they are present on Earth in small quantities.There have been recent claims for the preparation of elements 113, 117, and 118,but so far they have not been endorsed or named by IUPAC.

How does a plants food translate to plant growth (hint: energy is needed for growth)?

Answers

The plant food translates to plant growth with the use of photosynthesis. This are essential for plants as this will allow them to be provided with the nutrients they need in a way that will help them to continue to grow and to develop.

What reason does john proctor give for his reluctance to regularly attend church? What is another likely reason he hasn't been attending?

Answers

Another likely reason that he hasn't been attending is that he is ashamed of his affair with Abigail. He doesn't want to see her or be seen with her, so he is avoiding her.

Proctor's lack of regular church attendance was caused by his dread. They claim that you will go to hell if you don't attend church. His excuse for skipping church is that his wife is ill as well. If Parris is saying this, he probably has more important things to do, like taking care of his ailing wife.

When Hale inquires as to why John doesn't attend church frequently, he replies that his wife has been ill and that he detests Parris' displays of materialism. Ironically, when Hale asks Proctor to list his commandments, the only one he overlooks is adultery. Hale is not content.

Proctor is asked by Danforth if he has ever seen the Devil. Parris jumps in and accuses Proctor of rarely going to church.

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Combustion of a 0.9835-g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of co2 and 1.070 g of h2o. what is the empirical formula of the compound?

Answers

Find grams of C and H, using molar masses: 
12.0 g C  x  (1.900 g CO2 /  44.0 g CO2)  = 0.5182 grams C 
2.02 g H  x  (1.070 g H2O /18 g H2O) = 0.1201 grams H 

Since all the C and H in CO2 and H2O will come from the sample except oxygen, because we need to provide oxygen for sample to burn.

0.9835 g sample - 0.5182 g O - 0.1201 g H = 0.3452 grams O 


find moles, using molar masses: 
0.5182 grams C / 12.0 g/mol C = 0.0432 moles C 
0.1201 grams H / 1.01 g/mol H = 0.119 moles H 
0.3452 grams O / 16.0 g/mol O = 0.0216 moles O 

0.0216 is lesser, so use it to normalize to find the ratio.
find ratios: 
0.0432 moles C / 0.0216 = 2 moles C 
0.119 moles H / 0.0216 = 5.5 moles H 
0.0216 moles O / 0.0216 = 1 mole O 


so, the ratio is C2 H{5.5} O1
double the ration to eliminate decimals.
 
gives your answer is [tex]C_4 H_{11} O_2[/tex]


Final answer:

The empirical formula of the compound is determined by calculating moles of carbon and hydrogen from combustion products CO2 and H2O, followed by a stoichiometric conversion to the simplest whole number ratio.

Explanation:

To determine the empirical formula of the compound from the given combustion data, we start by calculating the molar amounts of carbon (C) and hydrogen (H) we have in the product. Since we have 1.900 g of CO2, we divide this by the molar mass of CO2 (44.01 g/mol) to find the moles of carbon. A similar calculation for the 1.070 g of H2O yields the moles of hydrogen by dividing by its molar mass (18.015 g/mol). Each mole of CO2 provides one mole of carbon, and each mole of H2O provides two moles of hydrogen.

How the atomic structure and covalent bonding properties of carbon atoms allow carbon to form many different types of molecules with many different functions?

Answers

Covalent bonds form through the sharing of at least 2 electrons. Carbon based rings & chains form very large molecules because carbon can form up to 4 covalent bonds to form these rings and chains, and these bond with other rings and chains over and over. Glucose→Starches. Lipids, proteins, carbohydrates, and nucleic acids are the 4 main types of carbon-based molecules in organisms. Nucleic acids form our genetic code. Genetic information is stored in those. Proteins are also made from nucleic acids.

Final answer:

Carbon's ability to form up to four stable covalent bonds leads to a myriad of organic molecules, from simple to complex, forming the foundation of biochemistry and all living organisms.

Explanation:

Atomic Structure and Bonding of Carbon

Carbon is fundamental to the chemistry of life due to its unique atomic structure and bonding properties. Each carbon atom has four electrons in its outer shell, enabling the formation of up to four stable covalent bonds with other atoms. This flexibility allows carbon to form a diverse array of molecules, including simple compounds like methane (CH4), to complex macromolecules found in living organisms, like proteins and DNA.

Carbon Skeletons and Functional Groups

The carbon atoms can be linked together to form various structures such as chains, branching chains, or rings, which are the backbone of organic molecules. These carbon skeletons can be augmented with functional groups like hydroxyl, carboxyl, amino, methyl, and phosphate groups, further increasing molecular diversity and facilitating biological functions.

Significance in Biochemistry

The vast potential for carbon to form a wide range of molecules with different functions is pivotal in biochemistry. Carbon's ability to form large chains and complex structures underpins the biological macromolecules that determine forms and functions of living systems.

What is the balanced equation for the double replacement reaction NaHCO2 and HCl?

Answers

The balanced equation for the reaction above is as follows:
NaHCO2 + HCl = NACl + H2CO2.
A double replacement reaction is a type of reaction in which two compounds react and the cations and the anions in the reactants switch places, thus forming two new compounds. In the reaction above, sodium and hydrogen switch places.

True or false in a neutral atom the number of protons is equal to the number of neutrons

Answers

The answer is False to this statement .

What is a neutral atom ?

In a neutral atom, the number of protons is equal to the number of electrons.

It has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.

Therefore from the above definition it can be understood that the statement that "in a neutral atom the number of protons is equal to the number of neutrons" is false

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Final answer:

In a neutral atom, the number of protons is equal to the number of electrons.

Explanation:

In a neutral atom, the number of protons is equal to the number of electrons, not the number of neutrons. An atom is considered neutral when it has an equal number of protons and electrons, resulting in a net charge of zero. The number of protons determines the atomic number of an element and is unique to each element.

The strength of the bond holding atoms together determines the hardness of a mineral. which has stronger bonds, your fingernail or a water glass?

Answers

A water glass has stronger bonds.

The strength of the bond holding atoms together determines the hardness of a mineral. Water glass has stronger bonds.

What is bond ?

An enduring attraction between atoms or ions known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds.

Covalent bonds are more powerful than ionic connections because of the close sharing of pairs of electrons (one electron from each of two atoms).

The strongest bindings found in nature are covalent bonds, which require the assistance of enzymes to be broken under normal biological circumstances. This is because the linked atoms share electrons equally, and when something is equally shared, there is never a conflict that could undermine the arrangement.

Thus, Water glass has stronger bonds.

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why is a bowling ball harder to lift than a basketball ?

Answers

a bowling all is harder to lift than a basketball is because a bowling ball weight more than a basketbal
let's not forget a bowling ball has way more mass than a basketball and if you were to weigh both if them obviously the bowling ball would weigh way more than the basketball.

How do inorganic and organic compounds differ?

Answers

smaller and simpler molecules many carbon compounds are built up from. ... Carbon will bond with lots of stuff so there is more atoms forming the molecules. How do inorganic and organic compounds differ? Organic compounds are made primarily of carbon atoms.

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                                                                                                   Thank you 
Final answer:

Organic compounds typically contain carbon and hydrogen, forming diverse structures and are prevalent in living organisms, while inorganic compounds may not contain carbon and are often salts, metals, and other elements. There are exceptions to the classification, but this distinction is based on the vast majority of known compounds.

Explanation:

Inorganic and organic compounds differ mainly in their composition and structure. Organic compounds contain carbon atoms and, typically, hydrogen atoms, forming the backbone of the compound. These compounds participate in diverse chemical reactions and are found in all living organisms. Examples of organic compounds include hexane (C6H14) and other carbon-based molecules.

Inorganic compounds, on the other hand, often lack carbon and hydrogen as a part of their primary structure. They include metals, salts, and other elements. A common example is sodium chloride (NaCl), also known as table salt, which is classified as inorganic.

It is important to note that while organic chemistry focuses on carbon compounds, inorganic chemistry is dedicated to the study of all other elements, which is reasonable given the vast majority of characterized compounds are carbon-based. Despite the basic classification, there are exceptions, such as carbon oxides and carbonates, which are considered inorganic despite containing carbon because they do not contain hydrogen.

What is the charge on an ion that has an atomic number of 24 and contains 22e-?

Answers

The atomic number actually represents the number of electrons in the atom. So when the atomic number is 24 and the actual number of electron is only 22, so this means that there is a deficit of 2 electrons. Hence the charge must be positive 2.

 

Answer:

2+

How can one tell, just by looking at the titration curve of an acid titrated by a strong base (with no calculations), if the analyte was a weak acid or a strong acid?

Answers

One can tell by looking at the titration curve of an acid and base whether the acid used is a strong acid or a weak acid. For a titration of a strong acid and a strong base, the pH at the equivalence point will be neutral, that is, pH 7. If the titration involves a weak acid and a strong base, the pH at the equivalence point will not be neutral, the solution will be basic at the equivalence point.

Where is a product found at the beginning or end of a chemical reaction?

Answers

A reaction is when two or more pure substances combine with each other to form another identity of pure substances. In general from, it is written as:

A + B → C + D

The substances A and B are the reactants, while the substances C and D are the products. Therefore, in a reaction, the products are found at the end or right side of the reaction.

How to write the formulas

Answers

if you have to write the chemical formula of a simple, binary ionic compound given the name of the compound, you follow a set of three steps. Let's go through them using magnesium chloride as an example. Write the symbols for the cation and the anion: Mg and Cl. Determine the charge on the cation and anion.

Suppose that a fictitious element, x, has two isotopes: 59x (59.015 amu) and 62x (62.011 amu). the lighter isotope has an abundance of 71.7%. calculate the atomic mass of the element x.

Answers

The atomic mass of the element would simply be equal to the sum of the weighted average of each isotope, that is:

atomic mass = 59.015 amu * 0.717 + 62.011 amu * (1 – 0.717)

atomic mass = 59.863 amu

Predict the mass of iron (III) sulfide produced when 3.0 g of iron filings react completely with 2.5 g of yellow sulfur solid, S8(s).
A) 1.5g Fe
B) 2.5g Fe
C) 3.5g Fe
D) 5.5g Fe

Answers

1) Chemical equation

16Fe(s) + 3S8(s) ---> 8Fe2S3

2) Molar ratios:

16 mol Fe : 3 mole S8 : 8 mol Fe2S3

3) Convert masses in grams to number of moles

number of moles = mass in grams / molar mass

a) iron, Fe

mass = 3.0 g
atomic mass = 55.845 g/mol

=> number of moles of Fe = 3.0g / 55.845 g/mol = 0.0537 mol

b) Sulfur, S8

mass = 2.5 g
molar mass = 8*32.065 g/mol = 256.52 g/mol

=> number of moles of S8 = 2.5g / 256.52 g/mol = 0.009746 mol

4) Limiting reactant

Theoretical ratio                           actual ratio

16 mol Fe / 3 mol S8                 0.0537 mol Fe / 0.009746 mol S8

5.33                                               5.50

So, there is a little bit more Fe than the theoretical needed to react all the S8, which means the S8 is the limiting reactant.

5) Calculate the number of moles of iron (III) produced with 2.5 g (0.009746 moles) of S8

3moles S8 / 8 moles Fe2S3 = 0.009746 moles S8 / x

=> x = 0.009746 * 8 / 3 moles Fe2S3 = 0.026 moles Fe2S3

6) Convert 0.026 moles Fe2S3 into grams

mass in grams = number of moles * molar mass

molar mass of Fe2S3 = 207.9 g/mol

mass = 0.026 mol * 207.9 g/mol = 5.40 g

7) Answer: option D)




answer is D.........

What is the value of the smallest bond angle in icl4−? enter the smallest bond angle of the molecule?

Answers

Answer : The value of the smallest bond angle in [tex]ICl_4^-[/tex] is, [tex]90^o[/tex]

Explanation :

Formula used  :

[tex]\text{Number of electrons}=\frac{1}{2}[V+N-C+A][/tex]

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

First we have to determine the hybridization of the given molecule, [tex]ICl_4^-[/tex].

[tex]\text{Number of electrons}=\frac{1}{2}\times [7+4+1]=6[/tex]

The number of electrons is 6 that means the hybridization will be [tex]sp^3d^2[/tex] and the electronic geometry of the molecule will be octahedral.

But as there are four atoms around the central atom iodine, the fifth and sixth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be square planar and the bond angle between the lone pair and the lone pair will be, [tex]180^o[/tex]  and the bond angle between the lone pair and the bond pair will be, [tex]90^o[/tex].

The structure of the given molecule is shown below.

Hence, the value of the smallest bond angle in [tex]ICl_4^-[/tex] is, [tex]90^o[/tex]

According to molecular geometry,the value of the smallest bond angle in   given compound is 90°.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

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1.The repeating pattern of the properties of elements from row to row in the periodic table is an example of ___________

2. An element that appears in Group 18 of the periodic table is called a(n) __________

Answers

1. Periodicity (the repetition of several properties in a row on the Periodic Table)

2. Noble Gas (Noble gases are located in group 18 on the Periodic Table)

What is a solution considered to be if it has a ph lower than 7?

Answers

Anything less that 7, would be a base.

Calculate the average bond order for a p−o bond (such as the one shown in blue) in a phosphate ion.

Answers

A phosphate ion is PO4(3-). Bond order = number of bonds / number of "connections" to an element. Bond order PO4(3-) = 5 / 4 = 1.25
Final answer:

The average bond order for a P-O bond in a phosphate ion can be calculated by the formula (bonding electrons - anti-bonding electrons) / 2, considering the 4 P-O bonds, the average bond order is approximately 1.5.

Explanation:

The average bond order of a P-O bond in a phosphate ion (PO43-) can be calculated using the formula and concept of bond order. Bond order is defined as the number of pairs of electrons between two atoms. In the case of a phosphate ion, there are 4 P-O bonds.

Each P-O bond involves a Pi bond and a Sigma bond. As such, to calculate the average bond order, we would first count all the bonding and anti-bonding electrons. Then, we subtract the number of anti-bonding electrons from the number of bonding electrons, divide by 2 to get the total bond order, and then divide by 4 (for the 4 P-O bonds) to get the average bond order.

However, as the electron configuration of phosphate is a bit complex, it is generally accepted that the average bond order of a P-O bond in a phosphate ion is around 1.5 considering resonance structures in which the phosphorus atom forms double bonds with different oxygen atoms

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