What Is The Difference Between Atomic Number And Atomic Mass?

The atomic number is the number of PROTONS in an atom.  Example - Carbon has 6.

The atomic mass is the number of PROTONS AND NUETRONS in an atom.  Example:  Carbon has 6 protons and 6 nuetrons so mass is 12!

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1. Number of protons present in the nucleus of an atom is called the atomic number of an element. It is denoted by Z. Combined number of protons and neutrons present in the nucleus of an atom is called the mass number of an element. It is denoted by A. The atomic and mass numbers of an atom X are often shown A X. For example 4He means

2.   Z   2

3. that the atomic number of helium is 2 and the mass number is 4.
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Atomic number is calculated by the number of protons present in atom. But the atomic mass is calculated by the cobine calculated number of protons and neutrons present in an atom.foe ex-
oxygen(o) has 8 protons so the atomic number of O is 8 but the atomic mass of O is 16 because there are 8 neutrons in the atom.
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Atomic Number: Number of PROTONS in an atom.
Atomic Mass: Number of PROTONS and NEUTRONS in an atom.
Mass Number: Number of PROTONS and NEUTRONS in an atom.
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Atomic mass is equal to the total weight of an atom.  Because most of the weight of an atom is due to the protons and neutrons (electrons don't weigh much), atomic mass is usually found by adding the number of protons and neutrons.

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