Answer :

(a) Magnesium has 3 valence electrons in the M shell.

(b) The valency of nitrogen in N2 molecule is 3.


(c) Isotopes have different mass numbers because their nuclei contain different number of neutrons.


(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass number are called isotopes.


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