The period number and group number of "Tantalum" (Z = 73) are respectively : — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: Write the electronic configuration of Tantalum (Z=73) relative to the noble gas Xenon (Z=54): [Xe] 4f14 5d3 6s2. Step 2: Since the highest principal quantum number is n=6, it belongs to the 6th period. The group number is calculated as the sum of valence s and d electrons: 2 + 3 = 5. Step 3: This places Tantalum in period 6, group 5, which matches option (c).