What distinguishes isotopes of the same element? By Ahmed Akber 🌐 Source Chemistry Knowledge Database ✅ Fact Checked 📊 Difficulty Medium 📅 Last Updated 13 Aug 2026 A. A different number of protons B. A different number of electrons C. A different number of neutrons D. A different atomic number Check Answer 💡 Explanation: Isotopes are atoms of the same element, meaning they have the same atomic number (number of protons). They are distinguished by having a different number of neutrons, which results in a different mass number. 📚 Topics: Chemistry Science 🎯 Exams: CSS GEN NTS PMS