Multiple Choice
In basic atomic theory, what uniquely identifies (defines) a chemical element?
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4. Atoms and Elements
The Atom (Simplified)
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In atomic structure, what determines the identity of an element?
A
The number of protons in the nucleus (the atomic number)
B
The number of electrons surrounding the nucleus
C
The total number of protons and neutrons (the mass number)
D
The number of neutrons 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 playing different roles.
Recognize that the number of protons in the nucleus is called the atomic number, which uniquely identifies an element.
Note that while electrons can vary in number (forming ions) and neutrons can vary (forming isotopes), the atomic number remains constant for a given element.
Therefore, the key factor determining the identity of an element is the number of protons in its nucleus, also known as the atomic number.
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