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Which one of the following arrangements ...

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy

A

`AlltOltCltCaltF`

B

`AlltCaltOltCltF`

C

`CltFltOltAlltCa`

D

`CaltAlltCltOltF`

Text Solution

Verified by Experts

The correct Answer is:
d
Elements with exactly half filled or completely filled orbitals are very stable. You have to supply energy to add an electron. Hence, their electron gain enthalpy has large positive values. The electron gain enthalpy becomes less negative in going from top to bottom in a group. It becomes more negative in going from left to right in a period.
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