(b) As one moves down the group, the electron gain enthalpy decreases because the atomic size grows and the new electron is further away from the nucleus.
Assertion (A): Electron gain enthalpy becomes less negative as we go down a group.
Reason (R): Size of the atom increases on going down the group and the added electron would be farther from the nucleus.
(a) Assertion and reason both are correct statements but reason is not correct explanation of assertion.
(b) Assertion and reason both are correct statements and reason is correct explanation of assertion.
(c) Assertion and reason both are wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
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![\[\left( \mathbf{iii} \right)\text{ }{{\mathbf{P}}^{\mathbf{3}-}},\text{ }{{\mathbf{S}}^{\mathbf{2}-}},\text{ }\mathbf{C}{{\mathbf{l}}^{}},\text{ }{{\mathbf{K}}^{+}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-9e135ccca95537425808d01a2026aa19_l3.png "Rendered by QuickLaTeX.com")
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![\[\left( \mathbf{A} \right)\text{ }\mathbf{1}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{p}}^{\mathbf{6}}}~\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-4e5bb330482f0744293b4adfc531e398_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{B} \right)\text{ }\mathbf{1}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{p}}^{\mathbf{4}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-d6053c2db0981662ae5726905c36efc8_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{C} \right)\text{ }\mathbf{1}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{p}}^{\mathbf{6}}}~\mathbf{3}{{\mathbf{s}}^{\mathbf{1}}}~\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-a76e95b592ec114208946333898c356f_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{D} \right)\text{ }\mathbf{1}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{s}}^{\mathbf{2}}}~\mathbf{2}{{\mathbf{p}}^{\mathbf{5}}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-39a728458277f2c0c56b6f3caacd43ef_l3.png "Rendered by QuickLaTeX.com")
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![\[\left( \mathbf{ii} \right)\text{ }\mathbf{I}+>\text{ }{{\mathbf{I}}^{-}}>\text{ }\mathbf{I}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-a7464c368804f0a28cde1894bd32bb60_l3.png "Rendered by QuickLaTeX.com")
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![\[\left( \mathbf{iv} \right)\text{ }{{\mathbf{I}}^{-}}>\text{ }\mathbf{I}\text{ }>\text{ }{{\mathbf{I}}^{+}}^{{}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-7de79f7e5e8187314bd7962083407d61_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{i} \right)\text{ }{{\mathbf{F}}^{}}~<\text{ }{{\mathbf{O}}^{\mathbf{2}-}}~<\text{ }\mathbf{M}{{\mathbf{g}}^{\mathbf{2}+}}~<\text{ }\mathbf{N}{{\mathbf{a}}^{+}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-acaf0dffafbb532357bb7c961ba42536_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{ii} \right)\text{ }\mathbf{M}{{\mathbf{g}}^{\mathbf{2}+}}~<\text{ }\mathbf{N}{{\mathbf{a}}^{+}}<\text{ }{{\mathbf{F}}^{}}<\text{ }{{\mathbf{O}}^{\mathbf{2}-}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-59b8fd0e0bc02f09a0dce6105e1a3ee9_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{iii} \right)\text{ }{{\mathbf{O}}^{\mathbf{2}-}}<\text{ }{{\mathbf{F}}^{}}~<\text{ }\mathbf{N}{{\mathbf{a}}^{+}}<\text{ }\mathbf{M}{{\mathbf{g}}^{\mathbf{2}+}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-70ee46859ecff0f07d87ddf80025e958_l3.png "Rendered by QuickLaTeX.com")
![\[\left( \mathbf{iv} \right)\text{ }{{\mathbf{O}}^{\mathbf{2}-}}~<\text{ }{{\mathbf{F}}^{}}~<\text{ }\mathbf{M}{{\mathbf{g}}^{\mathbf{2}+}}~<\text{ }\mathbf{N}{{\mathbf{a}}^{+}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-dd8b58c28bec5d6d898ba3debf2d258c_l3.png "Rendered by QuickLaTeX.com")