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The symbol Ca-40 denotes that A. a calcium atom contains 40 protons B. a calcium atom contains 40 electrons C. a calcium atom contains 40 neutrons D. a calcium atom has a mass number of 40
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The symbol Ca-40 denotes that

A. a calcium atom contains 40 protons
B. a calcium atom contains 40 electrons
C. a calcium atom contains 40 neutrons
D. a calcium atom has a mass number of 40

User Michael Tiller
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D. A calcium atom has mass of 40
User Pkatsourakis
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