d and f BLOCK ELEMENTS

Why is the enthalpy of atomisation generally high for transition elements?

• Weak intermolecular forces
• Low melting points
• Strong metallic bonding involving d-electrons
• High volatility

What contributes to the relatively low density of Scandium (Sc) compared to later transition elements?

• Its smaller atomic size
• Its higher atomic mass
• Its larger atomic size and lower atomic mass
• Its filled d-subshell

According to Table 4.2, what is the approximate ionic radius of Fe2+?

• 74 pm
• 77 pm
• 65 pm
• 82 pm

What is the electronic configuration of a neutral Iron (Fe) atom?

• [Ar] 3d5 4s2
• [Ar] 3d6 4s2
• [Ar] 3d7 4s2
• [Ar] 3d8 4s2

Based on Table 4.2, which element has the highest second ionization enthalpy (ΔiH° II) among Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn?

• Nickel (Ni)
• Zinc (Zn)
• Copper (Cu)
• Cobalt (Co)