d and f BLOCK ELEMENTS

What is the electronic configuration of the ground state of Technetium (Tc, Z=43)?

• [Kr] 4d⁶ 5s¹
• [Kr] 4d⁴ 5s³
• [Kr] 4d⁵ 5s²
• [Kr] 4d³ 5s⁴

What is the electronic configuration of the ground state of Molybdenum (Mo, Z=42)?

• [Kr] 4d⁴ 5s²
• [Kr] 4d⁶
• [Kr] 4d³ 5s³
• [Kr] 4d⁵ 5s¹

What is the electronic configuration of the ground state of Niobium (Nb, Z=41)?

• [Kr] 4d³ 5s²
• [Kr] 4d⁵
• [Kr] 4d⁴ 5s¹
• [Kr] 4d² 5s³

What is the electronic configuration of Titanium (Ti, Z=22) in its ground state?

• [Ar] 3d³ 4s¹
• [Ar] 3d⁴
• [Ar] 3d¹ 4s³
• [Ar] 3d² 4s²

Why are Zn, Cd, and Hg not considered transition elements despite being in the d-block?

• They are liquids at room temperature
• They have no d-electrons
• They are not metals
• They have completely filled d orbitals in their ground state and common oxidation states.