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Modern Periodic Table and Periodic Properties — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryModern Periodic Table and Periodic Properties3 Marks
Question
(a) Why do the halogen atoms have a very strong electron affinity? Explain.
(b) Arrange Br, F, I and Cl in the order of increasing electron affinity.
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Answer

(a) In case of halogens, for any period, the nuclear charge is maximum and atomic volume is minimum. The above factors favour an increase in the force of attraction exerted by the nucleus on the electrons. Thus, halogen atoms have a maximum tendency to attract an extra electron in their valence shell and hence have strong electron affinity.
(b) I, Br, F, Cl are in the increasing order of electron affinity.

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