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The melting points of the transition elements first rise to a maximum and then fall as the atomic number increases, manganese have abnormally low melting points.

1. The melting points of the transition elements first rise to a maximum and then fall as the atomic number increases.
2. Manganese have abnormally low melting points.
3. Both (a) and (b).
4. None of the above.

Correct answer: Both (a) and (b).

Solution

Both statements are correct. Transition elements show a trend in melting points due to metallic bonding, and manganese has a low melting point due to its half-filled d-orbital configuration, which weakens metallic bonding.

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