How you can use atoms mass number atomic number and charge to determine how many protons neutrons and electrons
Answers
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
Related Questions
Electrons move about the nucleus of an atom in regions called what?
Answers
The two jovian planets that contain the highest proportions of hydrogen compounds are ___________.
Answers
Jupiter and Saturn contain the highest proportions of hydrogen compounds. They are primarily composed of hydrogen and helium with hydrogen being the dominant element, and their atmospheres house several hydrogen-based gases and complex hydrocarbons.
Explanation:The two Jovian planets that contain the highest proportions of hydrogen compounds are Jupiter and Saturn. These planets, known as the gas giants of our solar system, consist primarily of hydrogen and helium, with hydrogen being the more abundant element. Jupiter and Saturn's high gravitational force has compressed the gases in their interior until the hydrogen becomes a liquid, earning them the often misleading label of 'gas planets'.
However, the bulk of both planets consists of compressed, liquefied hydrogen, so they could more accurately be referred to as 'liquid planets'. This hydrogen-rich composition has influenced the chemistry of the outer solar system. Subsequently, the atmospheres of these planets are heavily populated with hydrogen-based gases such as methane (CH4) and ammonia (NH3), or more complex hydrocarbons.
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What are elements 90-103 called on the periodic table?
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The elements 90 to 103 on the periodic table are called the Actinide series. They are part of the 'f-block' and are all radioactive. Some well-known actinides are Uranium and Plutonium.
Explanation:The elements numbered 90 to 103 on the periodic table are known as the Actinide series. These elements, which include Th (Thorium, 90) to Lr (Lawrencium, 103), are part of the 'f-block' and are often shown separately from the main body of the periodic table.
It is important to note that all of the actinides are radioactive, and some are not naturally occurring but synthesized in laboratories. The most well-known of these is probably U (Uranium, 92) and Pu (Plutonium, 94), commonly used in nuclear reactors and weapons.
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Which element in Group 1 has the greatest tendency to lose an electron?
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Which of these is a mixture
A. salad
B. sugar
C. water
D. potassium
Answers
How many protons are in Florine whose atomic number is 9 and atomic mass is 19? *
9
10
19
28
Answers
Sulfur has an atomic number of 16. What is the electron configuration for an electronically neutral atom of sulfur?Â
Question 1 options:
1 s 22 s 22 p 63 s 23 p 3
1 s 22 s 22 p 63 s 23 p 4
1 s 22 s 22 p 63 s 23 p 6
1 s 22 s 22 p 63 s 23 p 5
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The atomic number of sulfur is 16. The electron configuration for an electronically neutral atom of sulfur is 1 s 22 s 22 p 63 s 23 p 5. The correct option is d.
What is electronic configuration?The electronic configuration of an atom is the position of the electrons present inside the atoms. This process identified the position of electrons inside the atoms.
The different shells have different energy levels, and these energy levels are also reflected in the energy of electrons.
So, as the atomic number of sulfur is 16. If its electronic configuration is done. There will be 1 electron is the s orbital, 22 in s2 and 22 in the p orbital. The last orbital has 5 electrons.
Therefore, the electron configuration for an electronically neutral atom of sulfur is 1 s 22 s 22 p 63 s 23 p 5. The correct option is d.
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Which of the following elements is a gas at room temperature?
fluorine (F)
sulfur (S)
mercury (Hg)
iodine (I)
Answers
A reaction takes place in a bomb calorimeter. if the calorimeter decreases in temperature over the course of the reaction, what are the signs of qcal and qrxn?
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Answer:If the calorimeter decreases in temperature over the course of the reaction:
[tex]Q_{rxn}=Positive[/tex]
[tex]Q_{cal}=Negative[/tex](heat is lost by the caloriemter)
Explanation:
Whenever reaction takes place in calorimeter tone out of two things can a happen:
1. If the temperature of calorimeter increases: During a reaction when heat is released in the calorimter. This heat released is then absorbed by the calorimeter (Law of Conservation of Energy) which results in increase in temperature of calorimeter.
Those reaction which add on heat to their surrounding are termed as Exothermic reaction.
[tex]Q_{rxn}=Negative[/tex]
[tex]Q_{cal}=Positive[/tex] (Heat gained by the calorimeter)
2. If the temperature of calorimeter decreases: During a reaction when heat is lost from the calorimter. This heat loss is due to the absorption of heat by reactants during the reaction (Law of Conservation of Energy) which results in decrease in temperature of calorimeter.
Those reaction which absorbs heat from their surrounding are termed as Endothermic reaction.
[tex]Q_{rxn}=Positive[/tex]
[tex]Q_{cal}=Negative[/tex](heat is lost by the caloriemter)
Why is hydrogen bonding only possible with hydrogen answer?
Answers
How many liters of a 0.45% half-normal saline (m/v) solution for iv therapy can be prepared from 33 grams of sodium chloride?
Answers
NaCl weight= 0.45% * water mass
NaCl weight= 0.45% * water density* water volume
33g= 0.45%* 1000g/l * water volume
water volume= 33g/ (0.45% * 1000g/l)
water volume= 7.33 liter
Gold is a rare metal that is often blended with other metals to lower the cost of jewelry or art. What physical property of gold could help you determine if a piece is pure gold?
Answers
Answer:
Physical property is density.
Explanation:
This check needs precision. Gold is a dense metal, 19.32 grams per cubic centimeter. For that you have to calculate the density, weighing the piece on a scale, then you would fill a test tube with water and introduce the piece and note how much the water has risen. Density is defined as the mass divided by the displaced volume. If the result you get is close to 19 it will be a 24-karat gold piece.
Steel is an alloy of one or more elements combined with which metal
Answers
An alloy is when two or more metallic elements are combined for different purposes.
Steel is an alloy of one or more elements combined with Iron.
Hope This Helps You!
Good Luck :)
- Hannah ❤
Which quantum number determines the energy of an electron in a hydrogen atom? which quantum number determines the energy of an electron in a hydrogen atom? l n e ml n and l?
Answers
A Hydrogen atom only contains a single electron (1 e). Therefore for this atom, the quantum number which determines the energy of an electron is best represented only by the principal quantum number. The principal quantum number has a symbol of n.
Answer:
n
Saturated fats are typically liquid at room temperature. saturated fats are typically liquid at room temperature.
a. True
b. False
Answers
When water vapor becomes liquid water due to cooling, it is called _____?
Answers
On the other hand, evaporation is the change in the state of water from liquid to vapor due to heating.
Based on this,
When water vapor becomes liquid water due to cooling, it is called condensation.
Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm3. 42.4 ml 23.6 ml 18.5 ml 87.9 ml 31.2 ml
Answers
Volume = 455.6 / 19.3
VOLUME = 23.6ml
The volume of the object is 23.06 cm³
We have an object of given mass and density.
We have to calculate the volume of this object.
How is the Mass and Density of a body related to each other?The following relation exists between mass and density -
m = d x v
d - density of body
m - mass of body
v - volume of body
According to the question -
m = d x v
Rewrite the relation as follows -
v = m/d
Substitute the values -
v = 455.6 / 19.3 = 23.06 cm³.
Hence, the volume of the object is 23.06 cm³.
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In which orbital does an electron in a copper atom experience the greatest effective nuclear charge?
Answers
What is the identity of a sample that has a mass of 25.0 g and a volume of 2.38 cm3?
Answers
p=m/v
p=25g/2.38 cm^3
p=10.50 g/cm^3
Density of Silver is 10.5 g/cm^3
Hope I helped :)
Density of the given sample is 10.50 g /cm³ which is the density of silver.
What is density?Density of a substance is it's mass per unit volume.It is denoted by capital letter 'D'.It has SI unit of kg/m³.For a pure substance, density has numerical value which is same as it's mass.
Different materials have different densities which is found to be relevant to substance's purity and packaging.Osmium and Iridium are densest known elements.
Density is an intensive property because there is a narrow range of densities across the samples. It does not change with respect to the initial mass .It shows how much mass of substance is present in given amount of volume.
For the mentioned data, density is calculated as,mass/volume
which is 25/2.38=10.504 g/cm³
10.504 g/cm³ is the density of silver and hence the sample is of silver.
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What is formed when atoms of different elements are combined chemically?
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What is a reasonable estimate for the radius of an atom?
Answers
Answer is: 1 × 10⁻¹⁰ meter or 0.0000000001 meter.
The atomic radius is a measure of the size of the atom.
It is distance from the center of the nucleus of atom to the boundary of electron cloud.
The radius of atoms is between 30 and 300 pm (10⁻¹² m) or between 0.3 and 3 angstroms (10⁻¹⁰ m).
The radius generally decrease along each period of the Periodic table.
What is the electronic configuration of a selenium atom (se)?
Answers
or
[Ar] 3d10 4s2 4p4
Answer:
[tex]1s^{2}2s^{2}2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]
Explanation:
For this exercise is necessary to know the atomic number of Se, which is 34 and indicate the numbers of electrons that has this atom.
For the electronic configuration you just need to follow the direction of the arrow indicated in the attached image, which shows the distribution of the electrons in the atomic orbitals, until complete the 34 electrons that has the selenium atom. The super index indicates the number of electrons in a specific atomic orbital. Then the electron configuration of selenium atom is:
[tex]1s^{2}2s^{2}2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]
The electron configuration of the element chlorine ends in.
A. 3s2.
B. 3p6.
C. 3s23p5.
D. 3s23p7.
Answers
i hoped this helped
Which noble gas has the greatest atomic number?
Rn
Ar
Xe
Kr
Answers
Hope this helps
You are assembling cars, and your job is to put the wheels on the vehicles. You have 3520 wheels, 14040 nuts (4 nuts needed per wheel) and 1000 car bodies at the start of the day (you have time to do more than 1000, and there will be no deliveries of additional parts during the day).
How many possible cars can roll off the assembly line?
What is the limiting reagent in this case?
If you only get to put the wheels on 850 cars that day, what is your productivity?
Answers
3510/4=877.5 cars per 4 wheels
877 possible cars.
actual yield 850/theortical yield 877=96.92%
Round the following answer correctly. 5.40m x 3.21m x 1.871m = 32.431914 m^3
Answers
The raw result of 32.431914 m³ should be rounded to 3 significant figures. Therefore, it becomes 32.4 m³.
Identify Significant Figures:
5.40 m has 3 significant figures.3.21 m has 3 significant figures.1.871 m has 4 significant figures.Calculate the Raw Product:
The raw product of these measurements is 5.40 m x 3.21 m x 1.871 m = 32.431914 m³ (as given).
Determine Significant Figures for Final Answer:
When multiplying, the result should have the same number of significant figures as the measurement with the fewest significant figures. In this case, that is 3 significant figures (from 5.40 m and 3.21 m).
How does ph affect enzyme-catalyzed reactions?
Answers
Each enzyme has an optimum pH level at which it shows its highest activity. Below or above this pH, the activity level probably decreases.
What are enzymes ?Enzymes are biological catalysts in living bodies. There are thousands of individual enzymes present in human body itself. Each enzymes are having their specific functions.
Enzymes have a pocket like receptor structure on which the substrate can attach. Hence enzymes provide a perfect platform for a chemical reaction. Each enzymes has an optimum pH and temperature at which it can shows it highest activity.
For example, the enzyme pepsin functions in digestion in humans works at a pH of 2. Similarly the enzyme amylase will be active only at pH around 7. This way, enzymes activity is significantly dependent on the pH.
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Write the electron configurations of cu2+ and ag+. is each electron configuration consistent with the color you observed for each cation? explain.
Answers
The electron configuration of copper cation:
₂₉Cu²⁺ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ or [Ar] 3d⁹.
The electron configuration of copper cation:
₄₇Ag⁺ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ or [Kr] 4d¹⁰.
Copper and silver lose their outer s-orbital electrons before they lose their outer d-orbital electrons.
Each electron configuration is consistent with the color, copper solution is blue, silver solution is colorless.
The electron configuration of Cu²⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹. The electron configuration of Ag⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰.
The observed color of Cu²⁺ is typically blue, while the observed color of Ag⁺ is colorless. The electron configurations of these cations are consistent with their observed colors.
Electronic configuration refers to the arrangement of electrons in an atom, ion, or molecule. It describes the distribution of electrons among different energy levels, orbitals, and subshells within an atom or ion.
The electronic configuration is represented using a notation that indicates the energy levels (principle quantum numbers), subshells (s, p, d, f), and the number of electrons in each subshell. The Aufbau principle, Pauli exclusion principle, and Hund's rule are used to determine the order of filling the orbitals and the spin states of the electrons.
Cu²⁺ has an incomplete d-orbital with 9 electrons, which gives rise to a blue color due to the absorption of light in the visible spectrum. The absorption of light corresponds to the promotion of an electron from a lower energy d-orbital to a higher energy level.
On the other hand, Ag⁺ has a fully filled d-orbital with 10 electrons, which does not result in the absorption of visible light. As a result, Ag⁺ appears colorless.
The observed colors of Cu²⁺ and Ag⁺ ions are a result of the electronic configuration and the interaction of light with the d-electrons in the transition metals.
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What is the relationship between the number of protons and the number of electrons in an atom?
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What is the expected outcome of adding a catalyst to a chemical reaction?
a.the reaction will speed up.
b.chemical equilibrium will not be reached.
c.the reaction will slow down.
d.no change will occur?