Multiple Choice
Which number uniquely identifies a chemical element in the periodic table?
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4. Atoms and Elements
The Atom (Simplified)
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In the simplified atomic model, what determines an atom's identity (which element it is)?
A
The total mass of the atom
B
The number of neutrons in the nucleus
C
The number of electrons surrounding the nucleus
D
The number of protons in the nucleus (the atomic number)
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