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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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Knowledge Check

  • The melting points of alkali metals are low. Which of the alkali metals melts when room temperature becomes more than 30^@C -

    A
    K
    B
    Na
    C
    Cs
    D
    Rb

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