Q. An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number

A) 27

B) 25

C) 43

D) 35

✔ Correct Answer: 35

Exam Insight

The mass number of the atom is 35, calculated as the sum of protons (17, inferred from the electron configuration) and neutrons (18).

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