d and f BLOCK ELEMENTS

Based on Table 4.2, which element has the highest density among Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn?

• Iron (Fe)
• Cobalt (Co)
• Copper (Cu) and Nickel (Ni)
• Zinc (Zn)

What is the electronic configuration of the Cr2+ ion?

• [Ar] 3d3 4s1
• [Ar] 3d4
• [Ar] 3d5
• [Ar] 3d2 4s2

Why is the third ionization enthalpy of Scandium (Sc) relatively low compared to later transition elements?

• Scandium has fewer electrons
• Scandium has a lower atomic number
• Removing the third electron still leaves a configuration closer to a noble gas core
• Scandium has a larger atomic radius

According to Table 4.2, what is the approximate first ionization enthalpy (ΔiH° I) of Chromium (Cr)?

• 631 kJ mol–1
• 650 kJ mol–1
• 653 kJ mol–1
• 717 kJ mol–1

What is the electronic configuration of the Ti2+ ion?

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