Question
Physics Question on Atoms
Mass number of an atom is the sum of
A
number of protons + number of neutrons + number of electrons
B
number of protons + number of neutrons
C
number of protons + number of electrons
D
number of electrons + number of neutrons
Answer
number of protons + number of neutrons
Explanation
Solution
Mass number of an atom is the sum of nucleons, i.e., the sum of number of protons and that of neutrons.