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

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Answer: C. 1

Explanation: With 3 protons, the electronic configuration is 2, 1. Since there is 1 electron in the outermost shell, it will lose 1 electron to become stable. Therefore, its valency is 1 (this element is Lithium).

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

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