identify the largest and smallest ion given below: O2-,F-,Na+,Mg 2+

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Solution

Dear student,

The negative sign means the number of electrons and a positive sign means a lack of electrons.

$O^{2 -} w i t h a t o m i c n u m b e r 8 h a s 8 + 2 = 10 e l e c t r o n s F^{-} w i t h a t o m i c n u m b e r 9 h a s 9 + 1 = 10 e l e c t r o n s N a^{+} w i t h a t o m i c n u m b e r 11 h a s 11 - 1 = 10 e l e c t r o n s M g^{2 +} w i t h a t o m i c n u m b e r 1 w h a s 12 - 2 = 10 e l e c t r o n s S i n c e, a l l t h e s e i o n s h a v e 10 e l e c t r o n s i n t h e i r s h e l l t h e r e f o r e t h e s e a r e i s o e l e c t r o n i c s p e c i e s . T h e m o r e + t h e c h a r g e, t h e s m a l l e r t h e i o n i c r a d i u s . R e m e m b e r t h a t n e g a t i v e m e a n s a d d i n g e l e c t r o n s a n d t h e s e l e c t r o n s g o i n t h e o u t e r m o s t s h e l l s . A l s o, w h e n a n a t o m l o s e s e l e c t r o n s, i t a t t r a c t e v e n m o r e t i g h t l y t o t h e o n e s i t h a s l e f t . T h e i o n i c r a d i u s w i l l d e c r e a s e s . T h e o r d e r o f s i z e : M g^{2 +} < N a^{+} < F^{-} < O^{2 -}$

The largest ion is the $O^{2 -} n a d t h e s m a l l e s t o n e i s M g^{2 +}$

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