Which of the following is a key physical difference between transition metals and poor metals?

• A. Transition metals are usually less conductive than poor metals.
• B. Poor metals are more likely to form colored compounds than transition metals.
• C. Transition metals are generally harder and have higher melting points than poor metals.
• D. Poor metals are typically more ductile than transition metals.

Answer: (C)

Verified step by step guidance

1. Understand the properties of transition metals: Transition metals are elements found in the d-block of the periodic table and are known for their high melting points, hardness, and ability to form colored compounds due to d-electron transitions.
2. Understand the properties of poor metals: Poor metals, also called post-transition metals, are located to the right of transition metals in the periodic table and generally have lower melting points, are softer, and less conductive compared to transition metals.
3. Compare conductivity: Transition metals are typically good conductors of electricity, often better than poor metals, so the statement that transition metals are less conductive is incorrect.
4. Compare formation of colored compounds: Transition metals commonly form colored compounds because of their partially filled d orbitals, whereas poor metals rarely form colored compounds, so the statement about poor metals being more likely to form colored compounds is incorrect.
5. Compare hardness and melting points: Transition metals generally have higher melting points and are harder than poor metals, making this a key physical difference between the two groups.