Answer:
Mass Number = Number of protons
+ Number of neutrons
\[13\,\,\,\,\,\,\,\,\,\,\,=p\,\,\,\,\,\,\,\,+\,\,\,\,\,\,\,\,\,\,\,\,\,7\]
\[p=6\]
\[\therefore \] Atomic number = 6
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