Question

What are the various factors due to which the ionisation ethalpy of the main group elements tend to decrease down a group?

Answer 1

1. atomic number
2. atomic mass
3. atomic radius.


this are the some factors which affect on ionisation enthalpy.

hope it helps you.

Answer 2

Explanation:

the following factors decrease the ionization enthalpy in the elements of the main group from top to bottom:

Atomic size: atomic size increases due to addition of a new energy shell this decreases force of attraction towards nucleus and consequently ionization enthalpy decreases.

Screening effect: due to increase of inner electrons the shielding effect increases which reduces force of attraction towards nucleus and hence ionization enthalpy decreases.