Transcription of d - and - NCERT
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d - and - NCERT
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.
volatility. Their melting and boiling points are high. Fig. 8.1 depicts the melting points of transition metals belonging to 3d, 4d and 5d series. The high melting points of these metals are attributed to the involvement of greater number of electrons from (n-1)d in addition to the ns electrons in the interatomic metallic bonding.
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