What is the smallest unit of an element retaining its properties? By Rabia Anum 🌐 Source Chemistry Knowledge Base ✅ Fact Checked 📊 Difficulty Easy 📅 Last Updated 13 Aug 2026 A. Molecule B. Atom C. Proton D. Electron Check Answer 💡 Explanation: An atom is the smallest unit of an element that maintains the chemical properties of that element. 📚 Topics: Chemistry Science 🎯 Exams: CSS GEN NTS PMS