(i) Which is largest in size Cu+ , Cu2+ or Cu and why?(ii) Which eleme

1.	(i) Which is largest in size Cu+ , Cu2+ or Cu and why?(ii) Which element in periodic table has highest ionization energy (IE)?(iii) Which element is more metallic Mg or Al and why?
Answer» (i) Among Cu⁺ , Cu²⁺ or Cu, Cu is largest in size due to less effective nuclear charge. Cu No. of protons = 29, No. of electrons = 29 Cu⁺ No. of protons = 29, No. of electrons = 29-1 = 28 Cu²⁺ No. of protons = 29, No. of electrons 29-2 = 27 (ii) In the periodic table, helium (He) has highest ionization energy (IE). (iii) Among Mg or Al, Mg is more metallic due to its low ionization energy.

(i) Which is largest in size Cu+ , Cu2+ or Cu and why?(ii) Which element in periodic table has highest ionization energy (IE)?(iii) Which element is more metallic Mg or Al and why?

Answer»

(i) Among Cu⁺ , Cu²⁺ or Cu, Cu is largest in size due to less effective nuclear charge.

No. of protons = 29,

No. of electrons = 29

Cu⁺

No. of protons = 29,

No. of electrons = 29-1 = 28

Cu²⁺

No. of protons = 29,

No. of electrons 29-2 = 27

(ii) In the periodic table, helium (He) has highest ionization energy (IE).

(iii) Among Mg or Al, Mg is more metallic due to its low ionization energy.