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

a) Beryllium

b) Magnesium

c) Oxygen

d) Not possible

e) Oxygen

Answer 2

A)Neon
b)Magnesium
c)Silicon
d)Barium
e)Carbon