Question

Explain the trend in atomic radii of d—block element

Answer 1

Answer:

Atomic and Ionic Radii of D Block Elements

The larger decrease in atomic radii, in column 3 to 6 elements is due to the increase in effective nuclear charge but poor shielding because of the smaller number of d-electrons.

Answer 2

The d-block occupies the large middle section of the periodic table. The general electronic configuration of the d-block elements is (n-1)d^(1-10)ns(1-2). Though it has some exceptions.

• Generally, the ions of the same charge in a given series show decrease in their radius with increasing atomic number. It is so because the new electrons enters a d orbital each time the nuclear charge increases by unity(one).
• The same trend is with the atomic radius in a given series.
• The size is as per the following order:3d<4d~5d.
• The sizes of 4d and 5d elements are similar and this phenomenon is known as lanthanoid contraction.
• Also their physical properties are similar.
• Landhanoid contraction occurs due to the poor shielding of 4f electrons.

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