An element 'A' has mass number 24 and contains 12 neutrons. What is the valency of 'A'
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Explanation:
valencey of A element is 2
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mass no=no of protons+no of neutrons
no of protons=24-12=12
atomic no=no of protons=12
no of electrons=mass no-atomic no
=24-12
=12
valency=8-no of electrons
=8-12
= -4
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