Which statement is true about mass number?

Question

Which statement is true about mass number? — Exam MCQ

rrbjepyq.in · Accepted Answer

B. It is the sum of protons and neutrons present in the nucleus. — The mass number (A) of an atom is defined as the sum of protons and neutrons present in its nucleus. Both protons and neutrons are located in the nucleus and are collectively referred to as nucleons. In chemical notation, the mass number is usually written as a superscript to the left of the element symbol.

rrbjepyq.in · Answer

A. It is equal to the number of electrons in an atom.

rrbjepyq.in · Answer

C. It is the total number of protons and electrons in an atom.

rrbjepyq.in · Answer

D. It is always twice the atomic number.

Which statement is true about mass number?

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