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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
Total electrons = 15. Atomic number = 15.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability
Atomic number 16: 1s² 2s² 2p⁶ 3s² 3p⁴ (sulfur).
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability
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