Isotopes have the same number of protons but different numbers of neutrons from "summary" of Chemistry Simplified NCERT Class 11 by Sanjay Sharma
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This means that isotopes of an element have identical atomic numbers, which determine the element's identity, but varying mass numbers due to the different numbers of neutrons. For example, hydrogen has three isotopes - protium, deuterium, and tritium. Protium has one proton and no neutrons, deuterium has one proton and one neutron, and tritium has one proton and two neutrons. Despite having different numbers of neutrons, all three isotopes of hydrogen have one proton, giving them an atomic number of 1. Isotopes exhibit similar chemical properties since they have the same number of protons, which determines an element's chemical behavior. However, isotopes m...
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