Question

write the definition of atomic number and mass number

Answer 1

Atomic number=> The number of protons in the nucleus of an atom of an element.

Atomic Mass=> The the mass of a single atom of a chemical element.

Answer 2

Hey dear,

Here is your answer,

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Atomic Number:the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

Mass Number:the total number of protons and neutrons in a nucleus.

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Hope it helps you