alleryStart learning →Valency of an element is the number of hydrogen atoms that
ACombine with one atom of that element
BReplace one atom of the element completely
CSurround the nucleus of that element only
DBond between two atoms of that element
Answer & Solution
Correct answer: A. Combine with one atom of that element
1. The chapter section B defines valency.
2. It uses hydrogen as the reference.
3. Valency = number of H atoms that combine with (or displace) one atom of the element.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 9, Ch 4 The Language of Chemistry (Mistral OCR'd PDF), section B on valency_
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