Question
Asked By MidnightSapphire47 at
Answered By Expert
Damian
Expert · 1.0k answers · 1k people helped
Answer
D
Explanation
The number of protons in the nucleus of an atom is determined by its atomic number. The atomic number of calcium (Ca) is 20, which can be found on the periodic table. This atomic number indicates that a calcium atom has 20 protons in its nucleus. Therefore, the correct answer is D. 20.
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