Relative atomic mass of calcium is approximately _______ its atomic number.

equal

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twice

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thrice

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none of these

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Solution

The correct option is B twice
Relative atomic mass of calcium is approximately twice its atomic number. $C a_{20}^{40}$ has 20 protons and 20 neutrons. The masses of proton and neutron are comparable. Atomic mass is the sum of masses of protons and neutrons.

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