Question

Arrange the elements according to first ionization energy. 

Highest ionization energy

Lowest ionization energy

Answer Bank

 Si C Sn Ge

Answer 1

Si, C, Sn, Ge are all in same group of periodic table.

Rule: Ionisation energy decreases as we move from top to bottom in. A group.

This is because of increase in size

Elements appearing top to bottom in group are:

C

Si

Ge

Sn

So,

C would have highest ionisation energy and Sn would have lowest

Answer:

C

Si

Ge

Sn