d and f BLOCK ELEMENTS

What is the electronic configuration of Cr+?

• 3d5
• 3d4 4s1
• 3d6
• 3d3 4s2

What is the electronic configuration of Mn2+?

• 3d5
• 3d3 4s2
• 3d7
• 3d6

What does the text suggest about generalizing the stability of oxidation states based solely on ionisation enthalpies?

• It is a complex problem not amenable to ready generalisation
• Ionisation enthalpies are the sole determinant
• Higher ionisation enthalpies always mean more stable oxidation states
• Lower ionisation enthalpies always mean less stable oxidation states

According to the text, what is the general difficulty associated with achieving oxidation states greater than +2 for elements like Cu, Ni, and Zn?

• High third ionisation enthalpies make it difficult
• Low first ionisation enthalpies make it difficult
• They lack d-orbitals
• They have very high electronegativity

What is a notable feature of transition elements regarding their oxidation states, according to the text?

• They show a great variety of oxidation states in their compounds
• They only show one oxidation state
• They show fewer oxidation states than main group elements
• They only show positive oxidation states