The number of valence electrons in an atom with atomic number 18 is:

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answer is A.

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Detailed Solution

Numbers of valence electrons are 8 in an atom with atomic number 18.
Atomic number 18 is argon (Ar) which is a noble gas. Its electronic configuration is 2,8,8. It has 8 electrons in its outermost or the valence shell. It does not react with the other elements because its outermost valence is fully filled and it does not need to accept or gain electrons to fulfil its octet.

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