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What’s the group valance of atoms in the halogen family?

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in Chemistry – Class 11 by (148k points)
What’s the group valance of atoms in the halogen family?

(a) 2

(b) 1

(c) 9

(d) 7

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This interesting question is from Kossel-Lewis Approach to Chemical Bonding in division Chemical Bonding and Molecular Structure of Chemistry – Class 11

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The correct option is (b) 1

Explanation: The group valance can be calculated from Lewis symbols either by subtracting it from eight (more than 4) or having it equal (less than 4). The halogen family has 7 electrons in their outer orbit. So 8 – 7 = 1. Therefore the valency of the halogen family is 1.

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