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Questions  >>  CBSE XI  >>  Chemistry  >>  Structure of Atom
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Q)

An element with mass number 81 contains $31.7 \%$ more neutrons as compared to protons. Assign the atomic symbol.

$\begin{array}{1 1} (a)\;Br \\(b)\;Mg\\ (c)\;Na\\ (d)\;none\;of\;these\end{array} $

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