d and f BLOCK ELEMENTS

What is the electronic configuration of a neutral Zinc (Zn) atom?

• [Ar] 3d9 4s2
• [Ar] 3d10 4s1
• [Ar] 3d10 4s2
• [Ar] 3d8 4s2

Based on Table 4.2, which element has the highest standard electrode potential (E°) for the M2+/M couple?

• Zinc (Zn)
• Iron (Fe)
• Copper (Cu)
• Nickel (Ni)

What is the electronic configuration of a Mn2+ ion?

• [Ar] 3d3
• [Ar] 3d4
• [Ar] 3d5
• [Ar] 3d6

According to Fig 4.3, what happens to the atomic radii as you move from Sc to Zn?

• Generally increases
• Remains constant
• Generally decreases
• Fluctuates randomly without trend

What is the main factor influencing the physical and chemical similarity between Zr/Hf, Nb/Ta, and Mo/Re pairs?

• Identical electron configurations
• Same number of valence electrons
• Similar atomic radii due to lanthanoid contraction
• They belong to the same period