What does the atomic number equal? number of protons and neutrons in the atomic nucleus number of neutrons in the atomic nucleus number of protons in the atomic nucleus
Biology · Middle School · Mon Jan 18 2021
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The atomic number of an element equals the number of protons in the atomic nucleus. It is a unique identifier for each chemical element and determines the element's identity and its position in the periodic table. The number of neutrons can vary in the nucleus of an element, leading to different isotopes, but the atomic number (protons) stays the same for all isotopes of a given element.