Practice question

Given: The element with atomic number 71 belongs to which series? These values define the system as per NCERT data. Formula: Lutetium (Lu, Z=71) has [Xe] 4f^{14 5d¹ 6s², marking the end of the lanthanoid series (4f filling).. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. 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.