# Does dilithium exist? [duplicate]

Lithium has two electrons in $$\mathrm{1s}$$, filling the first energy level; and one valence electron in $$\mathrm{2s}$$. Could two $$\ce{Li}$$ atoms form a bond to create $$\ce{Li2}$$; like $$\ce{O2}$$ or $$\ce{C2}$$?

• In an article about relativistic quantum chemistry successfully predicting low mercury melting point, there is mentioned that mercury is one of few elements not forming diatomic molecules in gaseous phase, calling it pseudo noble gas. – Poutnik Apr 25 '19 at 5:09

Due to the diffuse nature of lithium’s atomic orbitals, the bonding is pretty weak (Wikipedia gives a binding energy of $$102\text{ kJ/mol}$$, about one fourth that for a hydrogen molecule); and the inter nuclear distance between the 2 lithium atoms is actually quite large.