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Biology, 31.07.2019 06:40, brrodriguez8oz5wvf
Calcium has an atomic number of 20 and an atomic mass (weight) of 40. therefore, we know that calcium has 20 protons 40 protons 20 electrons 40 electrons 20 neutrons (multiple choice)
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Calcium has an atomic number of 20 and an atomic mass (weight) of 40. therefore, we know that calciu...
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