Question

define atomic number, mass number and valency​

Answer 1

Answer:

Atomic Number and Mass Number. ... The number of electrons in the outermost shell gives us the valency of the atom. Similarly, the number of protons and neutrons are associated with the atomic number and mass number of the atom.

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Answer 2

Atomic number , A number of an atom is called Atomic Number.

Atomic mass , The sum (addition) of Protons and neutrons which is present in the Nucleus is called Atomic mass.

Valency, the gaining and the losing of electrons in the atom is called Valency .

Explanation:

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