Electronic Configuration of the First 30 Elements, in Order of Increasing Atomic Number: ; 1, Hydrogen, 1s ; 2, Helium, 1s ; 3, Lithium, 1s2 2s ; 4, Beryllium, 1s2 ... |
The first 30 elements in the periodic table have their electrons distributed in the following manner: Hydrogen (H): 1s1. Helium (He): 1s2. |
Orbital diagrams are a common way of showing electron configurations in which the orbitals are shown as boxes and the electrons as arrows. |
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