d and f BLOCK ELEMENTS

Which transition metal ion is expected to be colorless in aqueous solution?

• V²⁺
• Cr³⁺
• Mn²⁺
• Ti⁴⁺

Why is the +2 oxidation state common among transition metals of the first series?

• It involves gaining two electrons
• It involves the loss of two (n-1)d electrons
• It typically involves the loss of the two ns electrons, which are higher in energy than the (n-1)d electrons.
• It is the only stable oxidation state

What is the ground state electronic configuration of Copper (Cu, Z=29)?

• [Ar] 3d⁹ 4s²
• [Ar] 3d¹¹
• [Ar] 3d⁸ 4s³
• [Ar] 3d¹⁰ 4s¹

What is the ground state electronic configuration of Nickel (Ni, Z=28)?

• [Ar] 3d¹⁰
• [Ar] 3d⁷ 4s³
• [Ar] 3d⁹ 4s¹
• [Ar] 3d⁸ 4s²

What is the ground state electronic configuration of Cobalt (Co, Z=27)?

• [Ar] 3d⁹
• [Ar] 3d⁶ 4s³
• [Ar] 3d⁸ 4s¹
• [Ar] 3d⁷ 4s²