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The s-Block Elements
How does lithium occur in nature? Name the chief ores of lithium.
Lithium mainly occurs as silicate minerals but the amount present in any mineral is always small and thus extraction of the metal is not so easy. The chief ores of lithium are:
(i) Spodumene: LiAl(SiO3)2 containing 4·6% lithium.
(ii) Triphylite (Li, Na)3PO4 (Fe, Mn)3(PO4)2 containing up to 4% lithium.
(iii) Petalite, LiAl (Si2O5) containing 2·7 3·7% lithium.
(iv) Lepidolite, (Li, K, Na)2Al2(SiO3)2 containing 1·5% lithium.
Traces of lithium are also present in milk, blood, plants etc.
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The softness of group 1 elements increases down the group with increasing atomic number. Give reason.
Which is the most reactive alkali metal and why?
Why alkali metals do not form M2+ ions?
Name the radio active element in group 1. How does it resemble with the remaining elements of the group?
Why alkali metals are normally kept in kerosene oil?
Why lithium cannot be stored in kerosene?
Why does lithium form complexes?
Why are alkali metal ions diamagnetic and colourless?
Why are alkali metals the most electropositive in nature?
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