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Question
True or False.
The valency of an element of group 17 is 7.
True or False
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Solution
This statement is false.
Explanation:
Group 17 elements (halogens) have 7 valence electrons in their outermost shell. However, their combining capacity (valency) is 1, because they only need to gain 1 electron to complete a stable octet (8 − 7 = 1).
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