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The number of protons, neutrons and electrons in calcium is:

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a

20

b

36

c

18

d

25

answer is A.

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Detailed Solution

Concept- The calcium is the chemical element having symbol Ca. The atomic number of calcium is 20. The calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air since it is an alkaline earth metal.
The atomic number of calcium is

so the number of electrons is equal to protons is equal to

and the number of neutrons is atomic mass minus number of protons
i.e

The number of protons present in calcium are 20. Whereas the number of electrons present in calcium are also 20. In addition to this, the number of neutrons present in calcium are also 20. Therefore, the number of protons, number of neutrons and the number of electrons are equal, i.e, 20.
Hence, the correct option is 1.

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The number of protons, neutrons and electrons in calcium is: