Multiple Choice
Which of the following statements correctly describes the number of protons in an atom?
2
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2. Atoms & Elements
The Atom
Multiple Choice
Which characteristic of an atom always determines the identity of an element?
A
The number of neutrons in the nucleus
B
The atomic mass of the atom
C
The number of electrons in the atom
D
The number of protons in the nucleus
Verified step by step guidance1
Understand that the identity of an element is defined by a unique characteristic of its atoms.
Recall that atoms consist of protons, neutrons, and electrons, each with different roles.
Recognize that the number of protons in the nucleus, called the atomic number, uniquely identifies an element.
Note that the number of neutrons can vary in isotopes of the same element, so it does not determine the element's identity.
Understand that the number of electrons can change in ions, and atomic mass varies with isotopes, so neither defines the element's identity.
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