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Problem
Problem
Deduce the number of electrons, protons and neutrons in
15
31
P
3
−
^{31}_{15}P^{3-}
15
31
P
3
−
and
12
24
M
g
2
+
^{24}_{12}Mg^{2+}
12
24
M
g
2
+
. Explain your answers.
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