Atomic number of calcium is:

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answer is C.

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Detailed Solution

Concept- The atom has a nucleus in the centre of the atom where neutrons and protons are found. Electrons are found outside the nucleus revolving in their fixed orbits.
An element is represented as:

Where
X is the chemical symbol of the element.
Z is the atomic number.
A is the mass number.
Now, Atomic number (Z) of an element is equal to the number of protons of that element. And mass number (A) is the number equal to the sum of the protons and neutrons of the element.
Now, calcium belongs to group 2 and period 3 of the periodic table and its atomic number is 20.
Hence, the correct answer is 3.

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