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Which type of electric charge is carried by protons in an atom?
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2. Atoms & Elements
The Atom
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Which property determines the identity of an atom?
A
The number of electrons in the atom
B
The total mass of the atom
C
The number of neutrons in the nucleus
D
The number of protons in the nucleus
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Understand that the identity of an atom is defined by its atomic number, which is the number of protons in the nucleus.
Recall that the atomic number (Z) uniquely identifies each element on the periodic table, distinguishing one element from another.
Note that the number of electrons can vary in ions, and the number of neutrons can vary in isotopes, but these do not change the element's identity.
Recognize that the total mass of the atom depends on both protons and neutrons, but mass alone does not determine the element.
Therefore, the key property that determines the identity of an atom is the number of protons in its nucleus.
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