Question

defined atomic number​

Answer 1

Answer:

Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number. An atom of iron has 26 protons in its nucleus; therefore the atomic number of iron is 26.

Explanation:

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Answer 2

Answer:

Atoms are made up of three fundamental particles, i.e., protons (p), electrons (e), and neutrons(n).

The Atomic number denoted by Z is defined as the number of protons present in an atom's nucleus.

                                                      OR

The Atomic number is defined as the number of electrons present in a neutral atom.

Here is the bonus:-

Z = No. of e in an ion - charge of atom (with sign)

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