Lithium, Sodium potassium were put in one group on basis of their similar properties.
What are those similar properties?
What is the common name of this group or family?

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Solution

a) The similar properties between Lithium, sodium and potassium are,
All of them are soft metals.
They are good reducing agent.
They have one electron in the outermost shell.
They form unipositive ions.
All these metals impart colour to the flame.
b) The common name of the group is Alkali metals (Group IA)

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