The number of protons in the nucleus of an tom is referred to as its
A) atomic mass number
B) average atomic mass
C) proton number
D) atomic number

Question

Quizplus · Accepted Answer

The atomic number is defined as the number of protons in the nucleus of an atom. Therefore, option D is the correct answer. Options A, B, and C are incorrect because atomic mass number refers to the total number of protons and neutrons in an atom's nucleus, average atomic mass refers to the average mass of all isotopes of an element, and proton number is not a commonly used term in chemistry.

The Number of Protons in the Nucleus of an Tom