UNIT 10 THE s-BLOCK ELEMENTS
GROUP-1 ELEMENTS: ALKALI METALS
Electric configuration: All alkali metals have one valence electron, 1s2.
Atomic and ionic radii: The alkali metal atoms have the largest sizes in a particular period of the periodic table.
Ionization Enthalpy: The ionization enthalpies of the alkali metals are considerable low and decrease down the group.
Hydration Enthalpy: The hydration enthalpies of alkali metal ions decrease as we move down the group.
Physical Properties: All the alkali metals are silvery white, soft and light metals. These elements have low density which increases down the group. The melting and boiling point of alkali metals are low.
GROUP-2 ELEMENTS: ALKALINE EARTH METALS
Electronic configuration: These elements have two electrons in the s-orbital of the valence shell. Their general configuration is ns2.
Atomic and ionic radii: The atomic and ionic radii of the alkaline earth metals are smaller than those of the corresponding alkali metals in the same periods.
Ionization enthalpies: Alkaline earth metals have low ionization enthalpies due to fairly large size of the atoms.
Hydration enthalpies: The hydration enthalpies of alkaline earth metals ions decrease with increase in ionic size down the group.
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