How are elements arranged on the periodic table? 👤 By The Quiz Wire Editorial Team 🌐 Source Chemistry Knowledge Base ✅ Fact Checked 📊 Difficulty Easy 📅 Last Updated 01 Dec 2025 A. Atomic mass B. Atomic radius C. Valence electrons D. Increasing atomic number Check Answer 💡 Explanation: The modern periodic table is ordered by the number of protons (atomic number). 📚 Topics: Chemistry Science 🎯 Exams: CSS GEN NTS PMS
