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Q.

The nucleus of an element contains 9 protons.Its valancy would be :

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a

2

b

1

c

3

d

5

answer is A.

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Detailed Solution

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As nucleus of the element contains nine protons, its atomic number is 9. Hence, the electronic configuration of the element is 2, 7. It needs one more electron to attain the stable inert gas configuration. Hence, its valency is 1.

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