Question

atomic number

1. define atomic number:

Explanation:

The atomic number is a fundamental concept in chemistry (a subfield of Natural Science). It is defined as the number of protons present in the nucleus of an atom of a chemical element. This number determines the element's identity and its position in the periodic table. For example, hydrogen has an atomic number of 1 because its nucleus contains 1 proton, and helium has an atomic number of 2 because its nucleus contains 2 protons.

Answer:

The atomic number is the number of protons in the nucleus of an atom of an element, which determines the element's identity and its position in the periodic table.