d - and

The d- block of the periodic table contains the elementsof the groups 3-12 in which the d orbitals areprogressively filled in each of the four long f- block consists of elements in which 4 f and 5 forbitals are progressively filled. They are placed in aseparate panel at the bottom of the periodic table . Thenames transition metals and inner transition metalsare often used to refer to the elements of d-andf-blocks are mainly four series of the transition metals,3d series (Sc to Zn), 4d series (Y to Cd), 5d series (Laand Hf to Hg) and 6d series which has Ac and elementsfrom Rf to Cn. The two series of the inner transitionmetals; 4f (Ce to Lu) and 5f (Th to Lr) are known aslanthanoids and actinoids the name transition metals was derivedfrom the fact that their chemical properties weretransitional between those of s and p- block according to IUPAC, transition metals are definedas metals which have incomplete d subshell either inneutral atom or in their ions.

The d–block occupies the large middle section of the periodic table flanked between s– and p– blocks in the periodic table. The d–orbitals of the penultimate energy level of atoms receive electrons giving rise to four rows of the transition metals, i.e., 3d, 4d, 5d and 6d. All these series of transition elements are shown in Table 8.1.

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  Table, Block, Periodic, Orbitals, Periodic table, D block

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