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Which of the following models best illustrates the basic structure of an atom for teaching purposes?
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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 atomic mass of the atom
B
The number of neutrons in the nucleus
C
The number of protons in the nucleus
D
The number of electrons in the atom
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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 atomic number, which is the number of protons in the nucleus, uniquely identifies an element.
Note that while the number of neutrons can vary (isotopes) and the number of electrons can change (ions), these do not change the element's identity.
Conclude that the number of protons in the nucleus determines the identity of an element.
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