Question

An element A has 2 electrons in its fourth shell.State:

(a) its atomic number

(b) its electronic configuration

(c) its valency

(d) position in the periodic table

(e) is it a metal or non-metal

(f) is it an oxidising or reducing agent.

Answer 1

A) Z=20
b) $1s^2,2s^2,2p^6,3s^2,3p^6,4s^2$
c) 2
d) Fourth period in the second group of the Periodic Table
e) It is a metal (Alkali earth metal)

f). It is a reducing agent