Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?
-
\(^{58}_{28}X\)
- \(^{30}_{28}X\)
- \(^{28}_{30}X\)
- \(^{58}_{30}X\)
The correct answer is: A
Explanation
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
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