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Atomic Radius

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Question

Give Reason:
Chlorine shows similarities in properties with bromine and iodine present in group 17(VII A) of the Modern Periodic Table.

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Solution

Cl, Br and I belong to group 17(VII A) of the periodic table. Although the total number of electrons varies in these elements, they all contain 7 valence electrons.
A group in the periodic table consists of elements which have the similar properties and the same number of valence electrons. Valence electrons in an element take part in the reactions and hence elements with the same number of valence electrons display similar properties.

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Q. Assertion :Hydrogen can be placed in both I A group and VII A group of the modern periodic table. Reason: Similarity in properties with both IA and VII A group.

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Elements	Least atomic radius	Chemically least reactive
(i) F, Cl, Br (ii) Li, Na, K	.................... ....................	.................... ....................

(d) State one reason for keeping fluorine and chlorine in the same group of the periodic table.
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