Which is (are) correct among the following ? .

Options

A. The radius of `CI^(Θ)` ion is `1.56 Å` while that of `Na^(o+)` ion is `0.95Å` .
B. The radius of `CI` atom is `0.99` while that of Na atom is `1.54`
C. The radius of `CI` atom is `0.99` while that of `CI^( Θ)` ion is `0.81`
D. The radius of Na atom is 0.95 while that of `Na^(o+)` ion is `1.54` .

Answer

A, B

Explanation

`r_(CI)ltr_(Na)` [along the period `(rarr)` size decreases] but `r_(CI^(Θ)) gt r_(Na)^(o+)` as in `CI-`atom an an `e^(-)` has been added and an `e^(-)` has been removed from Na, leading to removal of 2s shell which is still there in CI-atom .