Question

element A atomic number 7 mass number 14
B electronic configuration 2,8,8
C electrons 13. neutrons 14
D Protons 18 neutrons 22
E electronic configuration 2,8,8,1
State (1) valency of each element in which one is a metal
(iii) which is a non-metal (iv) which is an inert gas.
Choose the correct option​

Answer 1

Answer:

1)C and E are metals of 3rd A and 1stA group consequently...

3)A is non metal of 5thA group

4)B and D are same that is Argon

this is inert gas

B is stable state..ns2np6 invita outer most orbital configuration...hence this is zero/inert gas group

Explanation:

A:atomic number 7 i.e.NITROGEN.(N)

B:Argon( Ar) inert gas with stable state

C:13 electrons having Aluminium metal

D:Argon is having 18 protons

E:4th orbital is outermost orbital...4S1 is that..hence this potassium K