Question on: JAMB Physics - 2017
Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?
A
\(^{58}_{28}X\)
B
\(^{30}_{28}X\)
C
\(^{28}_{30}X\)
D
\(^{58}_{30}X\)
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Correct Option: 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
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