Question

F,Cl and Br are the elements each having seven valence electrons.which of these (i) has the largest atomic radius,(ii)is most reactive? justify your answer stating reason for each. plz answer it fast..my xam is tommorrow

Answer 1

(i) Among these elements Bromine (Br) has the highest atomic radius,as the atomic radius increases as we descend along a particular group.
(ii)Here Fluorine (F) is the most reactive because here electronegativity and oxidising power is maximum in Fluorine.

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Answer 2

Br has the largest atomic radius. In a group, the size of an atom increases as one proceeds from top to bottom. This is due to the successive addition of shells.

(ii) Fluorine is the most reactive.The chemical reactivity of non-metals decreases on going down the group as it depends upon the tendency to gain electrons, which decreases down the group.