1.

Complete the following statements : (a) Magnesium has 2 valence electrons in the ___ shell. (b) The valency of nitrogen in N2 molecule is ___ (c) Isotopes have different mass numbers because their nuclei contain different number of ___ (d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called ___

Answer»

Complete the following statements :

(a) Magnesium has 2 valence electrons in the ___ shell.

(b) The valency of nitrogen in N2 molecule is ___

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

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



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