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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Priyanshu kumar
shib option B is correct... Regular trends is that IE decreases down the group but grp 10 elements Ni,Pd,Pt doesn't follow the trends...
Mainly IE decreases down the group due to increase in size and decreases in nuclear attraction.But for Pt as the 4f orbital added but it has poor shielding effect so due to lanthanide contraction also size of pd and pt almost remain same...And due to poor shielding effect of 4f orbital effective nuclear charge is more...So ionisation energy is more
value you can see... ..Ni- 7.61 eV pd - 8.3 eV and Pt =8.9 eV
grp 3 elements ,grp 13 and grp 14 elements the trends is regular..
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