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28 June, 15:01

Which of the following statements is true?

Ca does not react with other atoms because it has 8 electrons in its outermost shell.

Mg does not react with other atoms because its outermost shell is complete.

Ca is more reactive than K because Ca has to lose one more electron than K to complete its outermost shell.

Mg is less reactive than Na because Mg has to lose one more electron than Na to complete its outermost shell.

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  1. 28 June, 17:27
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    The last statement is true. which is:

    Mg is less reactive than Na because Mg has to lose one more electron than Na to complete its outermost shell.

    Explanation:

    Mg belongs to group II and Na belongs to group I.

    Group II elements are less reactive than Group I elements. This is because it is more difficult to lose two electrons compared to losing just one electron.
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