(i) The covalent compounds will be formed by only element E.
(ii)The element which is a metal with valency three is: D
(iii) The element which is a non-metal with valency three is: B
(iv) Element D has big size as we go from left to right in a period, due to same number of shells, the size of atoms decreases as the forces of attraction increases between the valence electrons and the nucleus.
(v)Elements C and F belongs to noble gases.
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