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The d-And-f-Block Elements

Short Answer Type

11.

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

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12. Why the melting points of transition elements are high?

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13. Why Zn, Cd and Hg are not regarded as transition elements?

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14.

Name the first element of 3rd transition series.

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15.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

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16. Why are transition elements so named?

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17. Why are transition elements known as d-block elements?

The transition elements are also known as the d-block elements, because while the outermost level contains at most two electrons, their next to outermost main levels have incompletely filled d sub-orbitals, which are filled-up progressively on going across the periodic table from 8to 18 electrons.

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