Do you know !! Lithium belongs to the group 1 ( alkali metals) , period 2 s-block element of the periodic table . Lithium is represented by the symbol “Li”. The atomic number of Lithium (Li ) is 3 and the mass number is 6.941. Li Electronic Configuration: The distribution of electrons in lithium electronicHow to draw Molecular Orbital Diagram of Li2 ,Li 2+ , Li2 – | Simplest Trick – Chemistry