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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
An atom can be represented thus,
\(^{Z}{A}X\) where Z = mass number
A = atomic number
A = number of proton = number of electrons in a free state = 28
Z = number of protons + number of neutrons = 28 + 30 = 58
\(^{58}{28}X\)is the representation