SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the atomic number of calcium (Ca)?
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2
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14
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18
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20
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Explanation:
Detailed explanation-1: -The mass number of an atom is the sum of the number of protons (p) and neutrons (n). Calcium has 20 protons and 20 neutrons. Therefore, the mass number of calcium = p + n = 20 + 20 = 40.
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