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The d-And-f-Block Elements

Multiple Choice Questions

271.

All actinides

Have short-lived isotopes
Exhibit variable valency
Are synthetic elements
Include elements beyond atomic number 104.

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272.

The magnetic moment of a manganese ion (Z = 25) is 6.92 BM. The symbol of the ion is

Mn²⁺
Mn⁴⁺
Mn⁺
Mn⁷⁺

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273. The inner-transition elements are the elements in which the added electrons go to:

(n – 1 )d and (n – 2) f orbitals
(n – 1)d and ns orbitals
(n – 1)d orbitals
(n – 1) f orbitals

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Short Answer Type

274. In the transition series, with an increase in atomic number, the atomic radius does not change very much. Why is it so?

With the increase in atomic number along a transition series the nuclear charge increase which tends to decrease the size of atom.
But te addition of electron in the d- subshell increase the screening effect which counter balances the increased nuclear charge.
Hence along a transition series the atomic radius does not change very much.

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