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Questions  >>  SAT  >>  Chemistry  >>  Atomic Structure
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Q)

If number of electrons of $^{37}X^-$ and $_{20}Y^{+2}$ are equal; find number of neutrons of $^{37}X^-$.

$\begin{array}{1 1}(a)\;18\\(b)\;23\\(c)\;20\\(d)\;40\end{array}$

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A)
Number of electrons of $_{20}Y^{+2}$ ;
20-2=18
So, $X^- $ also has 18 electrons. Number of protons of $^{37}X^-$ is;
18-1=17
Number of neutrons of $^{37}X^-$ is;
37-17=20
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