Question

Explain about
D Block Elements in Modern Periodic Table
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Answer 1

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The element belonging to all the B subgroups and VIII group are called transitional elements or d block element.

The general characteristics of these elements are as following :-

• have large charge/radius ratio;
• are hard and have high densities;
• have high melting and boiling points;
• form compounds which are often paramagnetic;
• show variable oxidation states;
• form coloured ions and compounds;
• form compounds with profound catalytic activity;

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Answer 2

Answer:

The d block position in the periodic table consists of elements in the group of 3 to 12. In this group, the d orbitals are filled progressively. The elements which are present between the s and p block elements in the modern periodic table are called the transition elements. Transition elements usually have partly filled (n-1) d-orbitals.

In the transition elements, the last electron usually enters the penultimate d-orbitals i.e.(n-1) d orbitals and that is why they are called d-block elements in the modern periodic table. The general valence shell configurations of every transition elements are (n-1) d1–10.ns0, 1, 2.

All the d-block elements are classified into four series which are called 3d, 4d, 5d and 6d series corresponding to the filled outer shells of 3d, 4d, 5d, and 6d orbitals. Present in the center of the periodic table, the ‘d’ block elements lie in the middle of the s block elements on the left, and the non-metals of the p block, to its right.