The first ionization energy of the d-block elements are between s and p-block elements.
D Block Elements
Elements having electrons (1 to 10) present in the d-orbital of the penultimate energy level and in the outermost ‘s’ orbital (1-2) are d block elements. Although electrons do not fill up ‘d’ orbital in the group 12 metals, their chemistry is similar in many ways to that of the preceding groups, and so considered as d block elements.
These elements typically display metallic qualities such as malleability and ductility, high values of electrical conductivity and thermal conductivity and good tensile strength. There are four series in the d block corresponding to the filling up of 3d, 4d, 5d or 6d orbitals. There are 10 elements filling up the ‘d’ orbital in each series.
- 3d- Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn
- 4d- Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd
- 5d- La, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg
- 6d- incomplete.
First ionization energy of the d-block elements
- Ionization Energy of the d block elements is larger than s-block and smaller than the p-block elements, between which, they are placed.
- In the first series, except chromium and copper first Ionization Energy involves removal from filled s-orbital.
- Among them, Ionization Energy of d block elements increases with the increase in atomic number up to Fe.
- Thus, they are more electropositive than p-block elements and less electropositive than s-block elements.