Apentix/AP Chemistry/Unit 1: Atomic Structure and Properties/Question
AP Chemistryeasymcq1 pt

The number of protons in an atom is called its:

A.Mass number
B.Isotope number
C.Neutron number
D.Atomic number

Explanation

Core Concept

The atomic number equals the number of protons in an atom and uniquely identifies the element.

Correct Answer

DAtomic number

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