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Need for Classification

The mass numb...

Question

The mass number of calcium which has 20 protons and 20 neutrons is .

A

60

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B

20

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C

40

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Solution

The correct option is C 40
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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