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Q.

The nucleus of an element contain 9 protons. Its valency would be

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a

1

b

3

c

2

d

5

answer is A.

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Detailed Solution

Since its nucleus contain 9 proton so its. atomic number is 9 and its electronic configuration is 2, 7. So it require one more electron to complete its octet. Hence its valency is 1.

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