For the elements: $C l, B r, F, A l, C, L i, C s$ & $X e$ .
Choose the best option. The element having 8 electrons in the outermost shell is:

X e

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C s

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B r

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C

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Solution

The correct option is A $X e$
Xe is a noble element. All noble elements except He have 8 electrons in the outermost shell.

Hence option A is the correct answer

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(b) two elements that have two electrons in their outermost shells.

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N 3 -

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T e 2 < I - < X e < C s + < B a 2 +

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