The atomic number of an element is equal to the number of protons in its nucleus from "summary" of Chemistry Simplified NCERT Class 11 by Sanjay Sharma
The atomic number of an element is a fundamental concept in chemistry. It represents the number of protons present in the nucleus of an atom. Each element on the periodic table is defined by its unique atomic number, which distinguishes it from other elements. The atomic number is crucial because it determines the identity of an element. For example, hydrogen has an atomic number of 1, which means it has one proton in its nucleus. In contrast, helium has an atomic number of 2, indicating it contains two protons in its nucleus. This difference in atomic number is what makes hydrogen and helium two distinct elements. The atomic number also plays a significant role in the organization of the periodic tabl...
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