Electrons dot diagrams/Lewis Dot Diagrams show the symbol for the element surrounded by dots that show the number of valence electrons. Bohr diagrams show the amount of total number of electrons in...
Lithium is element number 3
Its nucleus contains 3 protons and 4 neutrons (Atomic Mass=7) and there are 3 electrons in orbit around the nucleus.
Since there can be only 2 electrons in any orbit....