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Which of the following has the lowest io...

Which of the following has the lowest ionization enthalpy?

A

Oxygen

B

Nitrogen

C

Fluorine

D

Sulphur

Text Solution

Verified by Experts

The correct Answer is:
D
In general, `Delta_(i)H_(1)` increases across the period (left to right) on account of the increase of effective nuclear charge while decreases on moving down the group on account of the increases in the number of shells. `O, N` and `F` are elements of teh `2nd` period while `S`(which comes below `O`)is an element of the `3rd` period. Thus, correct order of the increase of `Delta_(i)H_(1)` is
`F(1680 kJ mol^(-1))gt N (1402) gt O(1314) gt S(1000)`
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