Question

what are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down the group.?

Answer 1

Heya ______

Ques ___ what are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down the group ??

Ans _______

There are many factors by which ionization enthalpy of main group tends to decrease down in group ______

√ When the new shells are continuously added into old one group thus the force of attraction of metals from the group decreases it leads down ionization enthalpy...

√ As me move down in the main group the atomic size increases and the distance from nucleus decreases so the enthalpy also decrease...

Thank you

Answer 2

On moving down the group, atomic size increases, hence ionisation energy decreases.

(ii) With the addition of new shells the number

of inner shell electrons which shield the valence electrons from the nucleus increases. In other words, shielding or screening effect increases. As a result, the force of attraction of the nucleus for the valence electron further decreases and hence the ionisation energy decreases.

(iii) Nuclear charge increases down the group with increase in atomic number. As a result the force of attraction of the nucleus for the valence electrons should increase thus I.E., should increase. The combined effect of the increase in the atomic size and the screening effect more them compensates the effect of increased nuclear charge