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Generally the atomic and ionic radii inc...

Generally the atomic and ionic radii increase with increase in atomic number down the group. But the atomic size of aluminium and gallium is almost the same. This is because

A

The nuclear charge of Ga is higher than that of Al

B

Gallium contains intervening d-electrons which do not not screen the valence electrons effectively

C

the ionization energies of Ga and Al are comparable

D

All of the above.

Text Solution

Verified by Experts

The correct Answer is:
B
Due to the poor shielding (screening) effect of d-electrons in case of Ga, the valence electrons attracted more strongly and hence the size is not increased
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Knowledge Check

  • Increase in atomic size down the group is due to

    A
    increases in number of orbit
    B
    increases in number of protons and neutrons
    C
    increase in number of protons
    D
    increase in number of protons neutrons and electrons

  • Increase in atomic size down the group is due to

    A
    Increase in number of ORBIT
    B
    Increase in number of protons and neutrons
    C
    Increase in number of protons
    D
    Increase in number of protons, neutrons and electrons

  • With the increases in atomic number in period

    A
    metallic character decreases
    B
    metallic character increases
    C
    chemical reactivity decreases
    D
    atomic size increases

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