The electron structures of hydrogen (H) and lithium (Li) are similar as " they both have 1 electron in an s sublevel".
The quantum theory defines a sublevel as an energy level. Sublevels in chemistry refer to the energy caused by electrons. Sublevels can also relate to energy caused with the nucleus in physics.
It is know that the atomic number of hydrogen is 1 and the atomic number of lithium is 3.
The electronic configuration of H = [tex]1s^{1}[/tex].
The electronic configuration of Li = [tex]1s^{2} 2s^{1}[/tex].
Its can be seen that hydrogen and lithium both posses 1 electron in s sublevel
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