Question

An element belongs to the 3rd period and group iii A 13 of the periodic table state a) the number of valence electrons b) the number of shells c) the name of the element

Answer 1

Explanation:

As it is in period 3 valence shell is 3 that is n=3 and since it's present in group 2, it has 2 valence electrons in the third shell. Hence its valence shell configuration is 3s

2

.

Hence in the first orbital, it will have 2 whereas in second orbital it will have 8 electrons, on the whole, it has 12 electrons that is the atomic number is 12. Hence the name of the element is magnesium.