Multiple Choice
Which element is described by an atom that has 35 protons and 45 neutrons?
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4. Atoms and Elements
Isotopes
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An atom has 18 protons and 22 neutrons. Which element is it, and what is its mass number?
A
Chlorine, mass number
B
Argon, mass number
C
Calcium, mass number
D
Argon, mass number
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