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Batra Sahab
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Asked: 2025-02-01T10:32:30+00:00 In:

An atom with 3 protons and 4 neutrons will have a valency of

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0%(a) 3
0% (b) 7
100%(c) 1 ( 3 voters )
0%(d) 4
Based On 3 Votes

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The atom with 3 protons is lithium (Li) because its atomic number is 3. The electronic configuration of lithium is 2,1, meaning it has one valence electron in its outermost shell.
Valency is the number of electrons an atom loses, gains, or shares to achieve a stable configuration. Since lithium loses one electron to achieve a stable configuration (like helium), its valency is 1.
So, the correct answer is:(c) 1.
Class 9th Science NCERT MCQ Questions
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    2 Answers

    1. (c) An atom with 3 protons and 4 neutrons (lithium) will have a valency of 1.

      https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/

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    2. Prem Kumar

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