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Size of Atoms and Ions

which of the ...

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which of the following is not related with lanthanoid contraction 1. atomic radius Zr andHf is almost same 2.ionisation energy of Hg is more than that of Cd 3.atomic radius of Al and Ga is almost same 4. atomic radius difference between In and Tl is less than that Ga and Tl

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Q. Following the transition elements, (IE)1 drops abruptly in Ga, In and Tl. This is due to :-
1. Decrease in effective nuclear charge.
2. Increases in atomic radius.
3. Removal of an electron from the singly occupied np orbitals of higher energy than the ns-orbitals of Zn, Cd and Hg.
4. None is correct.
With explanation.

Q. The pair of elements that has almost same atomic radius among the following is

Q. The atomic sizes of

G a

A l

are almost same because

Q. Assertion : Atomic radius of Ga is larger than that of aluminium.
Reason: Atomic radius always increases down the group.

Q. A increase in both atomic and ionic radii with atomic number occurs in any group of the Periodic table and in accordance with this the ionic radii of

T i (I V)

Z r (I V)

0.68 A^{o}

0.74 A^{o}

respectively; but for

H f (I V)

ion the ionic radius is

0.75 A^{o}

which is almost the same as that for

Z r (I V)

ion. This is due to:

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