......... is defined as the number of protons present in the nucleus of an atom.

Atomic number

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Mass number

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Both A and B

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None of these

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Solution

The correct option is B Atomic number
Atomic number is defined as the number of protons present in the nucleus of an atom and it is denoted by $Z$ .
For hydrogen, $Z = 1$ , because in a hydrogen atom, only one proton is present in the nucleus. Similarly, for carbon, $Z = 6$

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Similar questions

Consider the following statements:

1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element.

2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.

3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes.

Which of the above statements is incorrectly stated?

Which sub-atomic particles of an atom are present in the nucleus of an atom?

A = Electrons

B = Protons

C = Neutrons

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