Practice question

Given: What is the atomic number of an element with 3 electrons in its 2p subshell? These values define the system as per NCERT data. Formula: Total electrons = 2 + 2 + 3 = 7, so Z = 7 (nitrogen).. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Configuration up to 2p with 3 electrons: 1s² 2s² 2p³. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.