MCQ
Which one of the following is expected to have largest size
- A${F^ - }$
- B${O^{ - 2}}$
- C$A{l^{ + 3}}$
- ✓${N^{ - 3}}$
✓
Answer
Correct option: D.
${N^{ - 3}}$
d
(d) Due to having three electrons atomic size increases.
(d) Due to having three electrons atomic size increases.
${F^ - } = 9 + 1 = 10$ electrons ; ${O^{ - 2}} = 8 + 2 = 10$ electrons
$Al + 3 = 13 - 3 = 10$ electrons ; ${N^{3 - }} = 7 + 3 = 10\,{e^ - }.$
Because electrostatic force between nucleus and $\bar e$ cloud is least in nitrogen.
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