Which element is more metallic Mg or Al and why?

CBSE Class 11 CBSE Class 11 Chemistry
,
1

(i)Which is largest in size ${{Cu}^{+}}$, ${{Cu}^{2+}}$ or Cu and why?
(ii) Which element in periodic table has highest ionisation energy (IE)?
(iii) Which element is more metallic Mg or Al and why?

2

(i) Cu is largest due to less effective nuclear charge. It has 29 electrons, 29 protons, ${{Cu}^{+}}$ has 28 electrons and 29 protons, ${{Cu}^{2+}}$ has 27 electrons and 29 protons.
(ii) He has highest ionisation energy.
(iii) Mg is more metallic due to lower ionisation energy.