Practice question

Given: Which element has the configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d^{10 4s² 4p⁶? These values define the system as per NCERT data. Formula: Total electrons = 2 + 2 + 6 + 2 + 6 + 10 + 2 + 6 = 36, corresponding to krypton (Z = 36).. This is standard NCERT relation. Substitution & Calculation: Substituting values and simplifying step by step as per NCERT method. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.