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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.

$^{58}_{28}X$

B.

$^{30}_{28}X$

C.

$^{28}_{30}X$

D.

$^{58}_{30}X$

View answer & explanation

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

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