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Discuss the positive of d-block elements in the perioidc table. |
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Answer» Solution :In a periodic table, the d-block ELEMENTS are flanked between s-block elements are p-block elements and these elements occupy the large middle SECTION of periodic table. The elements of d-block are present from GROUP 3 group -12 in periods 4 to 7. These elements have the d-orbitals of the PENULTIMATE energy level of atoms that receive ELECTRONS giving rise to four rows of the transition elements i.e., 3d, 4d, 5d and 6d as follows: (i) The first transition series OR 3d- series belongs to `4^(th)` period (ii) The second transition series OR 4d-series belong to `5^(th)` period (iii) The third transition series OR 5d-series belong to `6^(th)` period (iv) The fourth transition series OR 6d-series belong to `7^(th)` period Hence, these are in all forty elements with ten elements in each series |
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