Question

which element has
{a} two shells , both of which are completely filled with electrons?
{b} the electronic configurations 2,8,2 ?
{c} a total of three shell,with four electrons in its valency shell?
{d} a total of two shell with three electrons in the valency shell?
{e} twice as many electrons in its second shell as in its first shell?

Answer 1

1.neon (2,8)
2.magnesium
3.titanium
4.aluminium
5.carbon

Answer 2

$\huge\mathfrak{Answer→}$

a) Neon has two shells which are completely filled.

b) Silicon has the electronic configuration 2, 8, 2

c) Carbon has a total of three shells, with four electrons in its valence shell

d) Boron a total of two shells, with three electrons in its valence shell

e) Magnesium has twice as many electrons in its second shell as in its first shell