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The s-Block Elements
why is melting point of lithium higher than sodium ?
It is because they have a strong tendency to lose the valence s-electron to acquire the nearest inert gas configuration. Lithium, however, because of it high ionisation enthalpy forms covalent compounds i.e. alkyl lithium (R – Li), aryl lithium (Ar – Li) etc.
Down the group new shell added which cause shielding effect and thus cause lower the melting point.
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Why are alkali metals not found in nature?
Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?
What is the nature of lithium compounds?
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?
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