Multiple Choice
Which element is represented by an atom that has 9 protons and 10 neutrons?
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4. Atoms and Elements
Isotopes
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An atom has 14 protons and 15 neutrons. Which element is it (and what is the isotope’s mass number)?
A
Silicon, mass number
B
Silicon, mass number
C
Aluminum, mass number
D
Phosphorus, mass number
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