The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

1
\(\rm^{31}_{15}X\)
2
\(\rm^{31}_{16}X\)
3
\(\rm^{16}_{15}X\)
4
\(\rm^{15}_{16}X\)

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