Identify the least reactive element from the following.

_{8} X^{16}

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_{10} X^{20}

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_{11} X^{23}

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_{9} X^{19}

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Solution

The correct option is B $_{10} X^{20}$
Atomic number $_{10} X^{20}$ is a Neon element which is a noble gas and least reactive element whereas, $_{8} X^{16}$ is Oxygen, $_{11} X^{23}$ is Sodium and $_{9} X^{19}$ is Fluorine which are reactive elements.

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Identify the least reactive element from the following.

The correct option is B 10X20Atomic number 10X20 is a Neon element which is a noble gas and least reactive element whereas, 8X16 is Oxygen, 11X23 is Sodium and 9X19 is Fluorine which are reactive elements.

The correct option is B $_{10} X^{20}$
Atomic number $_{10} X^{20}$ is a Neon element which is a noble gas and least reactive element whereas, $_{8} X^{16}$ is Oxygen, $_{11} X^{23}$ is Sodium and $_{9} X^{19}$ is Fluorine which are reactive elements.