The atomic number of an element is always equal to:

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Number of neutrons in nucleus

Half of the atomic weight

Electric charge of the nucleus

Weight of the nucleus

answer is C.

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Detailed Solution

Concept- The atomic number of a chemical element determines where it belongs in the periodic table, which arranges the elements according to the number of protons in their nuclei. As a result, the number of protons—which is always equal to the number of electrons in a neutral atom—determines the atomic number.
The general definition of the atomic number is based on the number of protons in the nucleus of an atom. While when an atom is in its neutral state, its potential might also be equal to the number of electrons.
The amount of protons an element has determines its atomic number. The electrical charge of the nucleus can be thought of as the proton.
Hence, the correct answer is option (3).

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