Identify less reactive element from the following :

_{8} Y^{16}

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_{10} Y^{20}

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_{11} Y^{23}

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_{9} Y^{19}

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Solution

The correct option is B $_{10} Y^{20}$
Out of given options $_{10} Y^{20}$ has inert gas configuration. Thus $_{10} Y^{20}$ is least reactive as it has a stable electronic configuration (completed octate).

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The reaction in which more reactive element displaces the less reactive element from its compound is called_______.

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