Respuesta :
Answer:
(i) Ionization enthalpy:
Alkaline earths have higher ionization enthalpy values than alkali metals. This is because the atomic size of alkaline earths is smaller than that of alkali metals.
(ii) Basicity of oxides:
On dissolution in water, the oxides of alkali metals and alkaline earth metals form basic hydroxides. The basicity of alkali metal oxides is higher than that of alkaline earth metal oxides due to lower ionization enthalpy of alkali metals than that of corresponding alkaline earths. Due to this, the M-OH bond in alkali metal hydroxides can more easily ionize.
(iii) Solubility of hydroxides:
Alkaline earths have larger lattice energies than alkali metals due to small size and high charge. Hence, alkaline earth metal hydroxides have lower solubility than alkali metals.
Comparison between the alkali and alkaline earth metals are that alkali metals are soft, have high M.P. & shows magnetism and alkaline are hard, have low M.P. & no magnetism.
What are alkali and alkaline earth metals?
Alkali earth metals are those elements which are present in the first period of the periodic table and alkaline earth metals are those which are present on the second group of the periodic table.
- Physical properties: Alkali metals are soft in nature & have low melting point and alkaline earth metals are hard in nature & relatively have high melting point.
- Chemical properties: Hydroxides of alkali metals are strongly basic and hydroxides of alkaline metals are less basic.
- Magnetic properties: On the outermost shell of alkali earth metals one unpaired electron is present as a result of which it shows some magnetism property and alkaline metals have two valence electrons and does not show magnetism.
Hence the comparison between them are discussed above.
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