The mass number of a nucleus is?
A
Always less than its atomic number
B
The sum of the number of protons and neutrons present in the nucleus
C
Always more than the atomic weight
D
A fraction
Verified Correct Answer: B.
Chemical Principles & Mechanism
mass number, is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
Source: WAEC / JAMB / NECO Classroom Archive (Record #60498)