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# What makes up an atomic number?

Last updated date: 14th Jul 2024
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Hint: We know that in order to answer this question, try to proceed by defining an atom. Then, describe the subatomic particles of which an atom is made. And, then you will get an idea about the atomic number and mass number of an atom. Try to remember what is the formula used to calculate the atomic number and mass number and you will get your answer.

Protons and neutrons are responsible for the formation of atomic numbers. In the nucleus of an atom the number of protons present gives us the atomic number. Atoms of the same element exhibit the same atomic number. Atoms of different elements exhibit different atomic numbers. The atomic number is denoted by the letter $Z$.except hydrogen all other atoms consist of protons, electrons and neutrons.
The atomic number gives us the count of protons present in an atom, which helps us in arranging them in their energy level. $_{Z}^{A}X$ Here the letter $Z$ represents the atomic number whereas the letter $A$ represents atomic mass. Atomic mass is the addition of protons and neutrons in an atom.