Question

Which of the following groups of the Periodic Table has exceptionally exothermic electron affinities? A. Noble...

Which of the following groups of the Periodic Table has exceptionally exothermic electron affinities?

A.

Noble Gases (Group VIII)
B.

Halogens (Group VIIA)
C.

Alkali Metals (Group IA)
D.

Group IIIA elements
E.

Alkaline Metals (Group IIA)
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Answer #1

Answer : B.) Halogens (Group 7A)

Electron affinity is defined as the amount of energy released when an electron is added to the valence shell of an element. It is basically an exothermic process as energy is released. The electron affinity basically increases from left to right in a period which means that the Group 7A elements have the highest electron affinity.

Nobles gases are an exception in this as they have zero electron affinity as they have complete valence shell.

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