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Which element is a neutral atom with 15 electrons?
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4. Atoms and Elements
The Atom (Simplified)
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In the simplified atomic model, what property gives an element its identity?
A
The number of protons in the nucleus (atomic number)
B
The number of electrons in the outermost shell (valence electrons)
C
The number of neutrons in the nucleus (mass number)
D
The total number of electrons in the atom (electron count)
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Understand that an element's identity is determined by a unique property of its atoms, which distinguishes it from other elements.
Recall that atoms consist of protons, neutrons, and electrons, but not all these particles define the element's identity.
Recognize that the number of protons in the nucleus, also called the atomic number, is what uniquely identifies an element.
Note that while electrons and neutrons affect chemical behavior and isotope characteristics, they do not change the element's identity.
Conclude that the atomic number (number of protons) is the fundamental property that gives an element its identity.
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