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Manganese and technetium have very low m...

Manganese and technetium have very low melting points. Why?

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Manganese and technetium have exactly half filled d-orbitals. Hence the electronic configuration is stable. Electrons are held tightly by the nucleus so that the delocalisation is less and metallic bond is much weaker than the preceding element.
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V PUBLICATION-THE d- AND f- BLOCK ELEMENTS-QUESTION BANK
  1. The atomic radii of the second and third transition series are almost ...

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  2. d-block elements have high melting and boiling points. Why?

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  3. Manganese and technetium have very low melting points. Why?

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  4. Name the transition element with highest density?

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  5. K2PTCl6' is a well known compound while the corresponding nickel salt ...

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  6. Copper cannot liberate (H)(2). from acids. Why?

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  7. Copper is the onty elemerit in the 1st transition series with a posit...

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  8. All the bonds between manganese and oxygen in '(KMnO4 are covalent. Wh...

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  9. Which is the highest oxidation state shown by any transition mètal?

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  10. Cr(2)O(7)^(2-) is a strong oxidising agent whereas MoO(3) and WO(3) ar...

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  11. Highest fluoride of Mn is MnF(4), whereas highest oxide is Mn(2)O(7) ....

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  12. Draw the structure of Mn(2) O(7) ?

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  13. Name the catnlyst used in (i) the manufacture of sulphuric acid by con...

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  14. Name the catalyst used in i) the oxidation of ammonia to nitric acid b...

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  15. Transition elements act as catalysts. Why?

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  16. Why the transition metal compounds are coloured?

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  17. Give the spin only formula fór calculating the magnetic moment of a tr...

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  18. Name the ores of Titanium?

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  19. . Name the metal, with highest melting point?

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  20. Name the common ores of i) Chromiüm ii) Molybdenum iii) Tungsten

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