\(^{58}_{28}X\)
\(^{30}_{28}X\)
\(^{28}_{30}X\)
\(^{58}_{30}X\)
Correct answer is A
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