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The melting and boiling points of Zn, Cd...

The melting and boiling points of Zn, Cd and Hg are low. How will you explain this ?

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In `Zn(3d^(10)4s^(2)), Dc(4d^(10)5s^(2))` and `Hg(5d^(10)6s^(2))`, the d-subshells are completely filled and so they do not contain any unpaired electrons in their d-subshell. Hence the metallic bonds present in them are very weak. Consequently they have very low melting and boiling points.
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (SHORT ANSWER TYPE)
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  8. Explain why iron is a transition metal but sodium is not.

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  9. Chromium is a typical hard metal, while mercury is a liquid, Explain.

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  10. The melting and boiling points of Zn, Cd and Hg are low. How will you ...

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  12. Explain why the paramagnetic character of the elements of first transi...

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  13. The 4d and 5d-series of transition metals have more frequent metal-met...

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  14. Explain why iron has higher melting point than copper.

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  15. In permanganate ion, there is a covalency between Mn and oxygen. How w...

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  16. Explain why electronic configurations of lanthanoids are not known wit...

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