Question

what is atomic number​

Answer 1

Answer:

The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus.

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Answer 2

Answer:

The atomic number or proton number of a chemical element is the number of protons or electrons found in the nucleus of every atom of that element.

The total no.of electrons/protons in an atom = atomic number

The number of protons and electrons in a stable neutral atom is always the same.  

The atomic number of an element becomes its unique identifier, and helps classify a new element.