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If calcium has atomic number 20 and mass number 40, the constituent of the atom is ...

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If calcium has atomic number 20 and mass number 40, the constituent of the atom is ____________

A. 20 protons, 10 neutrons and 10 electrons
B. 20 protons, 20 neutrons and 20 electrons
C. 20 protons, 20 neutrons and no electrons
D. 10 protons, 10 neutrons and 20 electrons




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