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The atomic number of an atom indicates the number of protons that the atom has.

All atoms contain protons, neutrons and electrons. (The exception is hydrogen which has only one proton and one electron). It is the number of protons that defines the element. So, helium with an atomic number of 2 will always have 2 protons.

Normally, the atom will have the same number of electrons as protons but there are many instances where this is not the case.

The number of neutrons can vary in some atoms. Let us take carbon as an example: It has an atomic number of 6 so it has 6 protons and 6 electrons. Most carbon atoms have 6 neutrons but a very small number have 8 neutrons. Although they are the same element, they are two different isotopes known as carbon 12 and carbon 14.

The Atomic Mass of an element is approximately the mass of each proton, neutron and electron added together.

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Q: What does the atomic number of and atom give?
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Related questions

Does the number of electrons in an atom give its atomic number?

The number of protons is equal to atomic number; in a neutral atom the number of electrons is also equal to the numbers of protons.


The number of protons and neutrons in an atom?

Depends on the atom. The atomic number will give you the number of protons. The atomic weight will give you approximately the number of protons and neutrons combined.


Does number of electrons in an atom give it atomic number?

The number of protons is equal to atomic number; in a neutral atom the number of electrons is also equal to the numbers of protons.


How many atoms in PVC?

We make atomic number by number of protons in a atom. PVC is not single atom. We cant give it a atomic number.


What do Protons give to an atom?

Number of protons = the atomic number of the element


What is the atomic number of an atomic indicate?

Atomic number of an atom shows the number of protons in the nucleus of the atom. OR Atomic number of an atom is the number of electrons in the atom when the atom neutrally charged


The atomic number is the number of an atom?

The atomic number is the number of _____ an atom


When you subtract the atomic number from the atomic mass it will give you the number of what?

the protrons, neutrons and electrons in a atom


The protons and neutrons in an atom add up to give the atom's?

Mass number/Atomic Mass


What is the atomic number of in atom?

atomic number is how much protons(positive atom) and neutrons(neutral atom) are there in an element. therefore an atom does not have an atomic number


What atomic number of an atom is?

The atomic number of an atom is the number of protons in its nucleus.


What is atomic number of an atom is?

The atomic number of an atom is the number of protons in its nucleus.