Valency of sodium (atomic number 11) is
A1
B2
C3
D0
Answer & Solution
Correct answer: A. 1
1. Sodium has electron arrangement 2, 8, 1.
2. It loses one outer electron to attain a stable octet.
3. The combining capacity, called valency, equals 1.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on valency_
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