Question

An element 'M' has atomic number 12:; (a) Write its electronic configuration.; (b) State the group to which 'M' belongs.; (c) State the period to which 'M' belongs.; (d) State the valency of 'M'.; (e) Is 'M' a metal or a non-metal?; (f) Write the formula of its oxide.(Delhi - 2012)

Answer 1

Answer:

1- 2,8,2

2- 2ND GROUP

3- 3RD PERIOD

4- 2

5- METAL

6- MO

Answer 2

The electronic configuration is 1s2 2s2 2p6 3s2

M belongs to group 2

M belongs to period 3

Valency of M is 2

M is a metal

Formula of its oxide is MO

• The electronic configuration is based on Auf-bau's Principle
• 3s2 indicates it belongs to group 2 and period 3
• Valency is 2 as it has 2 valence electrons
• It is a alkaline earth metal
• as its valency is 2 and oxygen also has a valency 2 so the formula of its oxide is MO.