Which element has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p²?
Total electrons = 14, corresponding to Si (period 3, group 14). Others: Al (13 electrons), P (15 electrons), Mg (12 electrons).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electronic Configuration and Types of Elements - s p d f Blocks