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21 December, 00:18

Which of the following statements is true?

-Neon is inert because its outermost shell is complete.

-Nitrogen is inert because its outermost shell has eight electrons.

-Oxygen is more reactive than fluorine because oxygen needs only one electron to fill its outermost shell.

-Fluorine is more reactive than neon because fluorine has to lose only one electron to fill its outermost shell.

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  1. 21 December, 00:34
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    The correct answer is : Neon is inert because its outermost shell is complete.

    Ne atomic number is 10 and has an electronic configuration of 1s ² 2s² 2p⁶. The outer shell is complete therefore Ne is inert, in other words inactive as its very stable with a complete outer shell.

    Nitrogen is not inert as its atomic number is 7 and electronic configuration is 1s² 2s² 2p³. therefore valence electrons are 5, it needs 3 more electrons to gain the complete outer shell configuration. Therefore this statement is incorrect.

    F has 7 valence electrons and needs only one more electron to complete its outer shell whereas O has 6 valence electrons and needs 2 electrons to complete its outer shell. Since F only needs one electron and O needs two electrons, F is more reactive than O therefore third statement is incorrect

    F is more reactive than Ne as Ne is inert, however F needs to gain one electron and not lose, to fill its outermost shell therefore this statement too is incorrect
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