Why did mendeleev switch iodine and tellurium?

The first thing you will need to do is find some information about your element. Go to the Periodic Table of Elements and click on your element. If it makes things easier, you can select your element from an alphabetical listing.

Use the Table of Elements to find your element's atomic number and atomic weight. The atomic number is the number located in the upper left corner and the atomic weight is the number located on the bottom, as in this example for krypton:

Krypton's data from the Table of Elements

Step 2 - The Number of Protons is...
The atomic number is the number of protons in an atom of an element. In our example, krypton's atomic number is 36. This tells us that an atom of krypton has 36 protons in its nucleus.

The interesting thing here is that every atom of krypton contains 36 protons. If an atom doesn't have 36 protons, it can't be an atom of krypton. Adding or removing protons from the nucleus of an atom creates a different element. For example, removing one proton from an atom of krypton creates an atom of bromine.

Step 3 - The Number of Electrons is...
By definition, atoms have no overall electrical charge. That means that there must be a balance between the positively charged protons and the negatively charged electrons. Atoms must have equal numbers of protons and electrons. In our example, an atom of krypton must contain 36 electrons since it contains 36 protons.

Electrons are arranged around atoms in a special way. If you need to know how the electrons are arranged around an atom, take a look at the 'How do I read an electron configuration table?' page.

An atom can gain or lose electrons, becoming what is known as an ion. An ion is nothing more than an electrically charged atom. Adding or removing electrons from an atom does not change which element it is, just its net charge.

For example, removing an electron from an atom of krypton forms a krypton ion, which is usually written as Kr+. The plus sign means that this is a positively charged ion. It is positively charged because a negatively charged electron was removed from the atom. The 35 remaining electrons were outnumbered by the 36 positively charged protons, resulting in a charge of +1.

Step 4 - The Number of Neutrons is...
The atomic weight is basically a measurement of the total number of particles in an atom's nucleus. In reality, it isn't that clean cut. The atomic weight is actually a weighted average of all of the naturally occurring isotopes of an element relative to the mass of carbon-12. Didn't understand that? Doesn't matter. All you really need to find is something called the mass number. Unfortunately, the mass number isn't listed on the Table of Elements. Happily, to find the mass number, all you need to do is round the atomic weight to the nearest whole number. In our example, krypton's mass number is 84 since its atomic weight, 83.80, rounds up to 84.

The mass number is a count of the number of particles in an atom's nucleus. Remember that the nucleus is made up of protons and neutrons. So, if we want, we can write:

Mass Number = (Number of Protons) + (Number of Neutrons)

For krypton, this equation becomes:

84 = (Number of Protons) + (Number of Neutrons)

If we only knew how many protons krypton has, we could figure out how many neutrons it has. Wait a minute... We do know how many protons krypton has! We did that back in Step 2! The atomic number (36) is the number of protons in krypton. Putting this into the equation, we get:

84 = 36 + (Number of Neutrons)

What number added to 36 makes 84? Hopefully, you said 48. That is the number of neutrons in an atom of krypton.

The interesting thing here is that adding or removing neutrons from an atom does not create a different element. Rather, it creates a heavier or lighter version of that element. These different versions are called isotopes and most elements are actually a mixture of different isotopes.

If you could grab atoms of krypton and count the number of neutrons each one had, you would find that most would have 48, others would have 47, some would have 50, some others would have 46, a few would have 44 and a very few would have 42. You would count different numbers of neutrons because krypton is a mixture of six isotopes.

In Summary...
For any element:

Number of Protons = Atomic Number
Number of Electrons = Number of Protons = Atomic Number
Number of Neutrons = Mass Number - Atomic Number
For krypton:

Number of Protons = Atomic Number = 36
Number of Electrons = Number of Protons = Atomic Number = 36
Number of Neutrons = Mass Number - Atomic Number = 84 - 36 = 48

Only dissociated substances are written as ions in equations. Dissociated substances must balance numerically, and electrically. The process in which ions leave a solution and regenerate an ionic solid is precipitation. Precipitate insoluble solid formed, dissolution and precipitation are opposite processes.

Mendeleev arranged the elements in his periodic table in order of increasing atomic mass.

Mendeleev used atomic mass and periodical similarities in chemical properties to organize the elements into a periodic table. His predictions for undiscovered elements confirmed the accuracy of his method when they were later found with matching properties.

Dmitri Mendeleev, the Russian chemist, is known for his work on organizing the periodic table. He used atomic mass to arrange the elements, which was the crucial property in his table design. Although originally elements were ordered by increasing atomic mass, Mendeleev also took into account the repeatable patterns and similarities in chemical properties that occurred after certain intervals, a characteristic now known as periodicity. This approach enabled Mendeleev not only to organize known elements but also to predict the properties of elements that were yet to be discovered. In some instances, Mendeleev had to place elements out of the strict atomic mass sequence to maintain proper grouping based on properties, demonstrating a periodic nature in the elemental characteristics.

Published in 1869, Mendeleev's periodic table left gaps for undiscovered elements and made predictions about their properties. When these elements were eventually discovered and matched Mendeleev's predictions, his periodic table became widely accepted. Today's periodic table is largely based on his pioneering work, with the added advantage of organizing elements by atomic number rather than atomic mass.

This is a process which is called as:

“Diffusion”

 

In the process of diffusion, molecules move from regions of higher concentration to regions of low erconcentration, just by moving at random. In one example, there is more oxygen in the lungs than there is in the blood, so by diffusion oxygen molecules will move into the blood.

The answer is Calcium (Ca)

xmoles (6.022x10^(23)) = number of atoms of water at STP 
I belive thats correct ^,^

Answer:Total atoms in 131.97 liters of water vapor at STP are[tex]1.0643\times 10^{25} atoms[/tex].

Explanation:

At STP, one mole of gas occupies 22.4 L of volume.

Then 131.97 L of the volume will be occupied by:

[tex]\frac{1}{22.4 L}\times 131.97 L=5.8915 moles[/tex]

Number of water vapor molecules :

[tex]Moles\times N_A=5.8915 mol\times 6.022\times 10^{23} mol^{-1}=3.5478\times 10^{24} molecules[/tex]

In 1 molecule of water vapor = 3 atoms

Total number of atoms in [tex]3.5478\times 10^{24} molecules[/tex]:

[tex]3\times 3.5478\times 10^{24} molecules=1.0643\times 10^{25} atoms[/tex]

Total atoms in 131.97 liters of water vapor at STP are[tex]1.0643\times 10^{25} atoms[/tex].

The highest point of a wave is called the crest. ... Wave height is the vertical distance between the crest and trough. Wavelength is the horizontal distance between waves in a series. Wavelength can be measured between two wave crests.

Answer:

Wavelength

Explanation:

A wave in general, is a disturbance that travels through a point in space. It is composed of a series of alternating peaks and valleys.

Peaks are points along the wave, where its amplitude or displacement from the rest position is maximum in a positive upward direction. These peaks are also referred to as 'crests'. Valleys or 'troughs' are points with maximum displacement in the negative downward direction.

In a water wave (or waves in general), the distance between two crests or peaks is referred to as the wavelength represented by the greek symbol, λ.

1 magnesium atom, 1 sulfur atom, 4 oxygen atoms.

There are 10 hydrogen atoms that bind and there are 2 pairs of free electrons in the non-binding O atom

Further explanation

Aldehydes are alkane-derived compounds containing carbonyl groups (-CO-) where one bond binds to an alkyl group while another binds to a hydrogen atom.

The general structure is R-CHO with the molecular formula :

[tex]\large{\boxed{\boxed{\bold{C_nH_{2n}O}}}[/tex]

Naming is generally the same as the alkane by replacing the suffix with -al

Butanal or butyraldehyde is an aldehyde which has 4 C atoms

Inside the structure there are 3 atoms involved in bonding:

1. Atom C with 4 valence electrons, requires 4 electrons to reach the octet 2. Atom O with 6 valence electrons, requires 2 electrons to reach the octet 3. Atom H with 1 valence electron, requires 1 electron to reach a duplet

In describing Lewis's structure the steps that can be taken are:

 1. Count the number of valence electrons from atoms in a molecule 2. Give each bond a pair of electrons 3. The remaining electrons are given to the atomic terminal so that an octet is reached 4. The remaining electrons that still exist in the central atom 5. If the central atom is not yet octet, free electrons are drawn to the central atom to form double bonds

In the Butanal structure (C₄H₈O) there is 1 double bond of the functional group (-CHO) between the C atom and the O atom

Learn more:

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Formal charge

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Keywords: butanal, aldehyde, Lewis structure, a valence electron

There are [tex]\boxed{10}[/tex] hydrogens and [tex]\boxed2[/tex] lone pairs in the Lewis structure of butanal. (Refer structure in the attached image)

Further Explanation:

The bonding between the different atoms in covalent molecules is shown by some diagrams known as the Lewis structures. These also show the presence of lone pairs in the molecule. These are also known as Lewis dot diagrams, electron dot diagrams, Lewis dot structures or Lewis dot formula. In covalent compounds, the geometry, polarity, and reactivity are predicted by these structures.

Lewis structure of [tex]{\mathbf{C}}{{\mathbf{H}}_{\mathbf{3}}}{\left( {{\mathbf{C}}{{\mathbf{H}}_{\mathbf{2}}}} \right)_{\mathbf{2}}}{\mathbf{CHO}}[/tex] :

The total number of valence electrons of [tex]{\text{C}}{{\text{H}}_3}{\left({{\text{C}}{{\text{H}}_2}}\right)_2}{\text{CHO}}[/tex] is calculated as,

Total valence electrons = [(4) (Valence electrons of C) + (8) (Valence electrons of H) + (1) (Valence electrons of O)]

[tex]\begin{aligned}{\text{Total valence electrons}}\left({{\text{TVE}}}\right)&= \left[{\left({\text{4}}\right)\left({\text{4}}\right)+\left({\text{8}}\right)\left({\text{1}}\right)+\left({\text{1}} \right)\left({\text{6}}\right)}\right]\\&=30\\\end{gathered}[/tex]

The general formula of aldehyde functional group is [tex]{\text{R}} - {\text{CHO}}[/tex] . The given molecule has also the same formula and therefore the given molecule is an aldehyde.

In [tex]{\text{C}}{{\text{H}}_3}{\left({{\text{C}}{{\text{H}}_2}}\right)_2}{\text{CHO}}[/tex] , the total number of valence electrons is 30. Here, [tex]{{\text{C}}_1}[/tex]  forms two single bonds, one with a hydrogen atom and other with [tex]{{\text{C}}_2}[/tex] . It also forms one double bond with an oxygen atom. [tex]{{\text{C}}_2}[/tex]  forms two single bonds with other two hydrogen atoms and two single bonds with [tex]{{\text{C}}_1}[/tex] and [tex]{{\text{C}}_3}[/tex]  separately. [tex]{{\text{C}}_3}[/tex]  forms two single bonds with two hydrogen atoms and two single bonds with [tex]{{\text{C}}_2}[/tex] and [tex]{{\text{C}}_4}[/tex] separately. [tex]{{\text{C}}_4}[/tex] forms one single bond with [tex]{{\text{C}}_3}[/tex]  and three single bonds with three hydrogen atoms. Oxygen forms one double bond with [tex]{{\text{C}}_1}[/tex] . Each hydrogen forms a single bond with carbon atoms and therefore 26 electrons are utilized. The remaining four are present in the form of lone pair on the oxygen atom. (Refer to the structure in the attached image)

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Molecular structure and chemical bonding

Keywords: Lewis structure, valence electrons, butanal, CH3(CH2)2CHO, single bonds, double bonds, carbon atom, hydrogen atom, oxygen atom, valence electrons.

I think it might be a Combustion reaction hope I'm right

Final answer:

The limiting reagent is the reactant that produces the least amount of product. Mass-mass calculations help determine this. The reactant that gives the lesser amount of product is the limiting reactant.

Explanation:

The limiting reagent is the reactant that produces the least amount of product. Mass-mass calculations can determine how much product is produced and how much of the other reactants remain. The key to recognizing which reactant is the limiting reagent is based on a mole-mass or mass-mass calculation: whichever reactant gives the lesser amount of product is the limiting reagent. For example, consider this reaction:

2A + 3B → C

If you have 4 moles of A and 5 moles of B, you can calculate the amount of product C formed from each reactant as follows:

4 moles A * (1 mole C / 2 moles A) = 2 moles C

5 moles B * (1 mole C / 3 moles B) = 1.67 moles C

From this calculation, you can see that A would be the limiting reagent since it produces the least amount of product C.

Balance the number of atoms of the key element on both sides. Add the appropriate number of electrons to compensate for the change of oxidation state. Add H+(in acid medium), or OH- (in basic medium), to balance the charge on both sides of the half-reactions; and H2O, if necessary, to balance the equations.

B. data that supports a hypothesis

I can help you with some of the ions

Cl- : the purpose of this is to alter neuron responsiveness to stimulation; also main component of stomach acid which is important in digestion; shift in erythrocytes

PO43- : forms Ca3(PO4) with Calcium which is important in hardening of bone and teeth; an important component of phospholipids; also a component of nucleotides; the most common intracellular anion; intracellular buffer

Final answer:

Zinc, iron, chloride, ammonium, and phosphate ions respectively contribute to enzyme function, oxygen transport, osmotic balance, acid-base balance, and energy transfer within the human body among other roles, highlighting their physiological significance.

Explanation:

The physiological significance of the ions Zn²⁺, Fe²⁺, Cl-, NH4+ and PO4³⁻extends across various important functions in the human body. Here we delve into each ion's role to clarify their critical contributions.

Zinc (Zn²⁺) plays a fundamental role in enzyme function, DNA synthesis, and the immune response. Iron (Fe²⁺) is essential for oxygen transport in the blood, as part of hemoglobin, and is also involved in energy metabolism. Chloride (Cl⁻) helps maintain osmotic balance, is part of hydrochloric acid production in the stomach, and assists in electrical activity of neurons. Ammonium (NH⁴⁺) results from protein metabolism and its regulation is vital for maintaining the body's acid-base balance. Phosphate (PO4³⁻ )is crucial for energy transfer within cells, as part of ATP, and contributes to the structure of DNA and RNA.

should be gas, since it has no volume nor shape.hope this helped

Delta H >0  means reaction is endothermic means energy is added.

Delta H  <  0 means  reaction is exothermic means energy is released.

It should be C.

Rubber.

Assuming that the percent composition that is given is based on volume, therefore amount og agarose needed would simply be the product of the fractional composition and the total volume of the solution, that is:

required agarose = 0.01 * 40 mL

required agarose = 0.4 mL

Final answer:

To make a 40 ml 1% agarose gel, you will need 400 mg of agarose.

Explanation:

Agarose gel electrophoresis:

To calculate the amount of agarose needed to make a 40 ml 1% agarose gel, you can use the formula:

Amount of agarose (mg) = volume of gel (ml) x concentration (%) x 10

Substitute the values into the formula; for a 40 ml 1% agarose gel, you will need 400 mg of agarose.

Final answer:

In one mole of C12H22O11, there are 12 moles of Carbon, 22 moles of Hydrogen, and 11 moles of Oxygen. Hence, the conversion factors between moles of each of these elements and moles of the compound are 1:12, 1:22, and 1:11 respectively.

Explanation:

To establish the conversion factors between moles of each constituent element and moles of the compound for C12H22O11, we first need to determine the number of moles of each constituent element in one mole of C12H22O11. The molecule C12H22O11 has 12 Carbon (C), 22 Hydrogen (H), and 11 Oxygen (O) atoms. Therefore, one mole of C12H22O11 contains 12 moles of C, 22 moles of H, and 11 moles of O. These are the conversion factors between moles of each element and moles of the compound - there is a 1:12 factor between C and C12H22O11, a 1:22 factor between H and C12H22O11, and a 1:11 factor between O and C12H22O11.

These factors originate from the definition of mole as a unit of substance containing the same number of atoms, molecules, ions, and other entities as the number of atoms in exactly 12 grams of 12C. This means that the molar mass of any substance in grams is numerically equivalent to its atomic or formula weight in amu.

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The compound C₁₂H₂₂O₁₁ has conversion factors for each element: 1 mole C₁₂H₂₂O₁₁ is equivalent to 12 moles of C atoms, 22 moles of H atoms, and 11 moles of O atoms.

These factors assist in converting between moles of the elements and the compound.

For the compound C₁₂H₂₂O₁₁, we need to determine conversion factors between moles of each constituent element and moles of the compound.

Here's a step-by-step approach:

Identify the number of each type of atom in one mole of the compound: C₁₂H₂₂O₁₁ has 12 carbon (C) atoms, 22 hydrogen (H) atoms, and 11 oxygen (O) atoms per molecule.

Write the conversion factors:

1 mole of C₁₂H₂₂O₁₁ contains 12 moles of C atoms:
(1 mole C₁₂H₂₂O₁₁ / 12 moles C)1 mole of C₁₂H₂₂O₁₁ contains 22 moles of H atoms:
(1 mole C₁₂H₂₂O₁₁ / 22 moles H)1 mole of C₁₂H₂₂O₁₁ contains 11 moles of O atoms:
(1 mole C₁₂H₂₂O₁₁ / 11 moles O)

These factors allow conversion between the moles of each element and the moles of the compound.

Correct question is: Write conversion factors between moles of each constituent element and moles of the compound for C₁₂H₂₂O₁₁ .

A condensation reaction is described to be a reaction wherein two molecules form an even larger product and consequently produces a smaller molecule as a by-product. For example, when two amino acids are combined, a dipeptide bond is formed. As a result, 1 molecule of water is produced as a by-product.

The atomic number is 79, therefore the atoms have 79 protons in their nuclei. Since the atom is uncharged, the number of protons equals the number of electrons: 79 electrons. The atomic mass is number of protons + neutrons. Since atomic mass is 197, 197-79= 118 neturons

Answer:

79 protons, 79 electrons and 118 neutrons

Explanation:

Hi, the atomic number of an element is equal to the number of protons it has.

For gold (Au): [tex]Protons_{Au}=79[/tex]

If the atom is uncharged (and only if it is uncharged), the number of electrons it has is equal to the number of protons.

For gold (Au): [tex]Electrons_{Au}=79[/tex]

At last, the atomic mass represents the protons plus the neutrons an atom has in its core. So:

[tex]Neutrons_{Au} + Protons_{Au}=197[/tex]

[tex]Neutrons_{Au}=197 - 79[/tex]

[tex]Neutrons_{Au}=118[/tex]

im pretty sure an octet of electrons is 8 valence electrons. Noble gases have these.

Final answer:

An octet of electrons refers to an atom having eight valence electrons, providing stability similar to a noble gas. The octet rule primarily applies to main group nonmetals; however, exceptions like hydrogen that only needs two electrons and elements capable of expanded octets due to d orbitals exist.

Explanation:

The octet rule is a fundamental concept in chemistry that states atoms tend to bond in such a way that each atom has eight electrons in its valence shell, which provides stability and an electron configuration similar to that of noble gases. Elements strive to achieve an octet of electrons when forming chemical bonds, like in the case of carbon in carbon tetrachloride (CCl₄) where carbon forms four covalent bonds to obtain an octet.

Atoms from the main group elements, particularly nonmetals in the second period such as carbon (C), nitrogen (N), oxygen (O), and fluorine (F), typically follow this rule to form stable molecules. However, there are exceptions like hydrogen, which only requires two electrons to fill its valence shell. Moreover, expanded octet situations can occur with elements in the third period and beyond, where these atoms can hold more than eight valence electrons due to having available d orbitals, as in the case for phosphorus in phosphorous pentachloride (PCl₅).

Final answer:

There are 1.98 × 10^24 sulfur atoms in 1.10 mol of aluminum sulfide.

Explanation:

The formula for aluminum sulfide is Al2S3. To determine the number of sulfur atoms in 1.10 mol of aluminum sulfide, we need to multiply Avogadro's number (6.022 × 1023 mol-1) by the number of moles of sulfur in the compound. In Al2S3, there are 3 sulfur atoms per molecule. Therefore, the number of sulfur atoms in 1.10 mol of aluminum sulfide is 3 × 1.10 × 6.022 × 1023 = 1.98 × 1024.

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Final answer:

In 1.10 mol of aluminum sulfide, there are 1.987 x 10^24 atoms of sulfur, based on the stoichiometry of Al₂S₃ and the use of Avogadro's number.

Explanation:

To determine the number of sulfur atoms in 1.10 mol of aluminum sulfide (Al₂S₃), it's essential to understand the compound's stoichiometry. Aluminum sulfide has a molecular formula of Al₂S₃, indicating that each mole of aluminum sulfide contains two moles of aluminum atoms and three moles of sulfur atoms.

Given 1.10 moles of Al₂S₃, the calculation to find the number of sulfur atoms involves multiplying the number of moles of aluminum sulfide by the ratio of sulfur atoms per mole of aluminum sulfide, then by Avogadro's number (6.022 × 1023 atoms/mol) to convert moles to atoms:

Total moles of sulfur = 1.10 moles Al₂S₃ × 3 moles S/mol Al₂S₃ = 3.30 moles STotal sulfur atoms = 3.30 moles S × 6.022 × 1023 atoms/mol = 1.987 × 1024 atoms of sulfur.

I believe the answer is 77 degrees kelvin

The periods of rotation are much shorter than that of the Earth, and as such, their "days" are shorter. However, their periods of revolution are much longer than that of the Earth, due to having to traverse a much greater distance compared to Earth.

the answer is ....    sp2

Answer: [tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]

Explanation: According to the law of conservation of mass, mass can neither be created nor be destroyed. Mass remains conserved. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Haber's process used for manufacturing of ammonia in terms of balanced chemical equation is:

[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]

Final answer:

The balanced chemical equation for the synthesis of ammonia using the Haber-Bosch process is N₂(g) + 3H₂(g) → 2NH₃(g), which is a crucial industrial reaction for producing fertilizers.

Explanation:

The balanced chemical equation for the Haber-Bosch process, where nitrogen and hydrogen combine to form ammonia, is as follows:

N₂(g) + 3H₂(g) → 2NH₃(g)

This represents the direct combination of nitrogen gas (N₂) and hydrogen gas (H₂) to yield ammonia (NH₃), which is widely utilized in the production of fertilizers. The Haber-Bosch process operates under high pressure and temperature to favor the formation of ammonia from its constituent elements. The coefficients in the balanced equation indicate the molar ratio at which the reactants combine to form the product.

Rainwater is fairly pure however it can also pick up some particulate matter and electrolytes from the air, although not much. It will be saturated with atmospheric CO2, so with a little buffering capacity, it will be at a pH of about 5.5, which is also the pH of carbonic acid, a weak acid. Hence rainwater is a weak acid.

We can calculate for the volume using the formula:

volume = mass / density

Therefore:

volume = 5.72 kg / (0.78 kg / L)

volume = 7.33333 L

 

We know that 1 mL = cm^3 and that 1 L = 1000 mL, therefore: 1  L = 1000 cm^3

volume = 7.33333 L * (1000 cm^3 / L)

volume = 7,333.33 L

A silver atom has to lose only 1 electron to achieve a pseudo-noble-gas electron configuration.