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Answer: The atomic number of calcium (Ca) is considered to be 20. The mass number or atomic mass of Calcium is known to be 40. The number of protons as well as number of electrons is equal to the atomic number of an atom. Therefore, the number of protons in calcium are 20.
The number of electrons in calcium are also 20. Along with this, the number of neutrons in calcium are also 20. Thus, the number of protons, number of neutrons and the number of electrons are equal, i.e, 20.
