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3d-, 4d- and 5d- series consists of 10 e...

`3d-, 4d-` and `5d-` series consists of `10` elements each? Explain.

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In `3d, 4d` and `5d` series, the differenting electron enters to `(n-1)d`-subshell. The maximum capacity of `d`-subshell is to accommodate `10` electrons. Thus, there are `10` elements each in `3d, 4d` and `5d` series `[(n-1)d^(1-10)]`.
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Knowledge Check

  • The 3d transition series contains elements from atomic number

    A
    21 to 30
    B
    21 to 29
    C
    21 to 31
    D
    22 to 30

  • Assertion : The order of atomic radii of Cu, Ag and Au is Cu lt Ag ~~ Au . Reason : The atomic radii of 4d series elements are larger than those of 3d series elements but generally the radii of 4d and 5d series elements are almost identical.

    A
    If both assetion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are ture but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

  • Assertion : 4d and 5d series elements have nearly same atomic radius. Reason : Lanthanoid contraction.

    A
    If both assetion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are ture but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

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