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# Identify the less reactive element from the following

$(a)\;_{8}Y^{16}\qquad(b)\;_{10}Y^{20}\qquad(c)\;_{11}Y^{23}\qquad(d)\;_{9}Y^{19}$

Answer : $\;_{10}Y^{20}$
the less reactive element is $\;_{10}Y^{20}$