Multiple Choice
Which of the following best describes the difference between a molecule and an atom, and provides a correct example?
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2. Atoms & Elements
The Atom
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Which of the following 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 protons in the nucleus
D
The number of electrons in the atom
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 within atoms of the same element, leading to isotopes, but does not change the element's identity.
Understand that the atomic mass depends on both protons and neutrons, and the number of electrons can change in ions, but neither determines the element's identity.
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