down the group shells increases i.e addition of d&f orbitals .but as we know screening effect is less for d&f orbits so there must be greater pull of outer most electrons then why 1st ionisation potential in decreasing down the group

Asked by nutan sathyanarayanarayanappa | 9th Nov, 2013, 09:34: AM

Expert Answer:

As you move down a group, first ionization energy decreases. This is because electrons are further from the nucleus and thus it is easier to remove the outermost electrons.

"SHIELDING" - Inner electrons at lower energy levels essentially block the protons' force of attraction toward the nucleus.  It therefore becomes easier to remove the outer electron.

 

Answered by Vaibhav Chavan | 11th Nov, 2013, 12:51: PM

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