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Which of the following representations is correct for an ato...

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 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