Alkall metals, when exposed to atmosphere react with oxygen, moisture and CO2 present in the air forming oxides, hydroxide and carbonates. In order to prevent the reaction the alkali metals are stored under kerosene.
Monday, April 13, 2020
Why LiCl is predominantly covalent while NaCl is ionic?
LiCl is covalent because Li+ ion is smaller in size as compared to Na+ ion and hence it has high polarising power than Na+ ion, as result LiCl is predominantly covalent while NaCl is ionic.
Why Li forms only oxides and not stable peroxide or superoxides ?
Lithium forms only oxides and not stable peroxide or superoxides, due to small size of Lithium, it has a strong positive field around it. On combination with the oxide anion (O-2), the positive field of lithium ion restricts the spread of negative charge towards another oxygen atom and thus prevents the formation of higher oxide.
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