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There is considerable increase in covale...

There is considerable increase in covalent radius from N to P. However, from Sb to Bi only small increase (of 7 pm) in covalent radius is observed. This is due to

A

poor shielding by completely filled d-and f-orbitals in Bi

B

similar electronegativity of Sb and Bi

C

the Bi being last element of the group

D

similar densities of Sb and Bi

Text Solution

Verified by Experts

The correct Answer is:
A
Poor shielding by `f-` and d-electrons enhences the effective nuclear charge in Bi. This causes contraction in size.
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Knowledge Check

  • The minimum increase in covalent radius is from

    A
    `C` to `Si`
    B
    `Si` to `Ge`
    C
    `Ge` to `Sn`
    D
    `Sn` to `Pb`

  • convalent and ionic (in a particular state )radii increase in size down that group. Only a small increase in covalent radius is observed as one moves from

    A
    `N` to`P`
    B
    `P` to`As`
    C
    `As` to`Sb`
    D
    `Sb` to`Bi`

  • The work done in increasing the radius of a soap bubble from R to 3 R is

    A
    `12 pi R^(2)T`
    B
    `64 pi R^(2)T`
    C
    `8 pi R^(2)T`
    D
    `16 piR^(2)T`
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