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The s-Block Elements
How does sodium occur in nature? Name the chief ores of sodium.
Occurrence: Sodium does not occur in nature in the free state due to its very reactive nature. In the combined state, it occurs to the extent of about 2.6% in the earth's crust. The main ores of sodium are:
1. Sodium chloride (NaCl) found as rock salt and in sea water.
2. Sodium nitrite (NaNO3) or Chile saltpetre.
3. Sodium carbonate (Na2CO3)
4. Borax (Na2B4O7 . 10H2O).
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Group 1 elements are called alkali metals. Why?
Why caesium can be used in photoelectric cell while lithium can not be?
In aqueous solution, Li+ ion has lowest mobility. Why?
Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.
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?
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