An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?
The atom has 7 neutrons and 8 protons.
The atom has 7 electrons and 8 protons.
The atom has 8 neutrons and 7 electrons.
The atom has 8 electrons and 7 protons.
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