atomic number 7 and mass number is 14 . Then what will be it's valency
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3 will be its valency according to your question
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Since the atomic number (no. of protons and and electrons) = 7
Its shell arrangement would be :
K-shell 2
L-shell 5
Therefore to achieve octet it will gain 3 electrons.
the valency of this substance is 3⁺
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