• Apr 11, 2026 edexcel chemistry 4ch01 jan 2013 paper ) Nitrogen C) Oxygen D) Fluorine Approach: Recall the electron configuration of elements. Nitrogen has 5 electrons in its outer shell, oxygen 6, fluorine 7. Therefore, the answer is D) Fluorine. Example 2: Calculation-Based Question Question: How many moles are in 12 gra By Dr. Hazel Ferry
