Question

Define the following:
atomic number, mass number, isotopes, isobars and valency.

Answer 1

Atomic number: Number of protons in the nucleus gives atomic number of an elements. It is denoted by Z.
Mass number: The sum of total number of protons and total number of neutrons present in the necleus of an atom gives mass number.
Isotopes: The atoms of same elements with same atomic number but different mass number.
Isobars: Atoms of different elements with different atomic number but same mass number are called isobars.


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Answer 2

Here's ur answer.
Hope it'll be helpful.