The nucleus of an element contains 9 protons. | vedclass

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(A) The atomic number of an element is equal to the number of protons in its nucleus. Since the element has $9$ protons,its atomic number is $9$. The

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$1$

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(A) The atomic number of an element is equal to the number of protons in its nucleus. Since the element has $9$ protons,its atomic number is $9$. The electronic configuration of this element is $2, 7$. To achieve a stable octet (noble gas configuration),the element needs to gain $1$ electron. Therefore,the valency of the element is $1$.

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

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