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What is the valency of an element with electronic configuration 2, 8, 6?
A6
B4
C2
D8
Answer & Solution
Correct answer: C. 2
1. The configuration shows 6 valence electrons in the outer shell.
2. The element belongs to Group 16 of the periodic table.
3. For groups 13 to 18, valency equals 8 minus number of valence electrons.
4. So valency = 8 − 6 = 2.
5. The element gains two electrons to complete its octet.
6. Hence its valency is 2.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_
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