The atomic number of an element X is 8 and that of element Y is 4. Both these elements can exhibit a valency of :(a) 1 (b) 2 (c) 3 (d) 4
Correct Answer: (b) 2
Explanation: Atomic number of element X is 8.
Electronic configuration is 2, 6. It will gain 2 electrons to complete its octet; so, its valency is 2.
Atomic number of Y is 4.
Electronic configuration is 2, 2. It will lose 2 electrons in order to completely fill its outermost orbit . So, the valency of Y is also 2.
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