The best explanation for not placing hydrogen with the group of alkali metals or halogens is.
(A) Hydrogen can form compounds with all other elements
(B) Hydrogen is much lighter element than the alkali metals or the halogens
(C) The IE of hydrogen is too high for group of alkali metals but too low for halogen group
(D) None of these
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(C). The IE of hydrogen is much higher than those of alkali metals and slightly higher than those
of halogens. For example IE of Cl is 1255 kJ/mole and IE of H is 1312 kJ/mole.