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Along the period (rarr) atomic//ionic ra...

Along the period `(rarr)` atomic`//`ionic radii and metallic character decreases while `IE`, `EN` , non-metallic character and oxidising power increases. Down the group `(darr)`, atomic`//`ionic radii, metallic character and reducing character increase while `IE` and `EN` decrease. However, `Delta_(eg)H^(ɵ)` becomes less negative down a group but more negative along a period.
Which of the following isoelectronic species has lowest `IE_(1)` ?

A

`K^(o+)`

B

`Ca^(2+)`

C

`S^(2-)`

D

`Cl^(ɵ)`

Text Solution

Verified by Experts

The correct Answer is:
C
`S^(2-)` have the largest size among the given isoelectronic ions, so it has the lowest `IE_(1)`.
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Along the period (rarr) atomic // ionic radii and metallic character decreases while IE , EN , non-metallic character and oxidising power increases. Down the group (darr) , atomic // ionic radii, metallic character and reducing character increase while IE and EN decrease. However, Delta_(eg)H^(ɵ) becomes less negative down a group but more negative along a period. Correct order of IE_(2) of the following is

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