Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?

Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?
A. 5828X
B. 3028X
C. 2830X
D. 5830X

Correct Option: Answer is A

An atom can be represented thus,

ZAX 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

5828Xis the representation

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