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Question

Calcium (Ca) has atomic number 20 and mass number 40. Which of the following statements is not correct about Ca atom?

A
The number of protons is same as the number of neutrons.
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B
The number of electrons is same as the number of neutrons.
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C
The number of protons is half the number of neutrons.
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D
The number of nucleons is double the number of neutrons.
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Solution

The correct option is D The number of protons is half the number of neutrons.
Number of Protons = atomic number = 20.
Therefore, number of protons = 20.
Number of electrons = number of protons = 20.
Number of neutrons = Mass number - number of protons = 40-20 = 20.
The only option states wrong about Ca is C.

Hence, the correct option is C.

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