Solveeit Logo
Login

Question

Chemistry Question on Classification of elements & periodicity in properties

Which ion has the largest radius?

A

Se2−Se^{2-}

B

F−F^{-}

C

O2−O^{2-}

D

Rb+Rb^{+}

Answer

Se2−Se^{2-}

Explanation

Solution

Being isoelectronic, greater the nuclear charge, smaller the size and lesser the nuclear charge, larger the size.
O2−(A.N.=8)>F−(A.N.=9)\underset{(A.N. = 8)}{O^{2-}} > \underset{(A.N.= 9)}{F^-} (1010 electrons)
Se2−(A.N.=34)>Rb+(A.N.=37)\underset{(A.N. = 34)}{Se^{2-}} > \underset{(A.N. = 37)}{Rb^+} electrons)
∴Se2−\therefore S{{e}^{2-}} has largest radius.