Why Is Calcium 2,8,8,2 If the Third Shell Can Hold 18 Electrons? | Electronic Configuration

If the third shell can hold 18 electrons, why does calcium have the electronic configuration 2,8,8,2? In this lesson, Mrs. Okpe explains the difference between the maximum number of electrons a shell can hold and how electrons actually arrange themselves. You will learn: • The K, L, M and N shells • How to calculate maximum shell capacity using 2n² • The meaning of s, p, d and f subshells • Why 4s fills before 3d in potassium and calcium • Why calcium has the arrangement 2,8,8,2 • How zinc reaches 2,8,18,2 Learn step by step with simple explanations and clear visuals. This lesson is suitable for SS1 Chemistry students, WAEC and NECO candidates, and anyone who wants to understand electronic configuration. Subscribe to Science with Mrs. Okpe for more Chemistry and Junior Intermediate Science lessons.    / @sciencewithmrsokpe   #ElectronicConfiguration #SS1Chemistry #ScienceWithMrsOkpe