3.4.3 - Electron construction for atoms of the first 20 facets when the electrons space arranged in their lowest power state, the atom is in the ground state. The following table summarizes the soil state electron construction of the an initial 20 aspects on the regular table. NB: the superscripts add up come the atomic number of the atom.

Name Atomic Number Electron Configuration
Period 1
Hydrogen 1 1s1
Helium 2 1s2
Period 2
Lithium 3 1s2 2s1
Beryllium 4 1s2 2s2
Boron 5 1s2 2s22p1
Carbon 6 1s2 2s22p2
Nitrogen 7 1s2 2s22p3
Oxygen 8 1s2 2s22p4
Fluorine 9 1s2 2s22p5
Neon 10 1s2 2s22p6
Period 3
Sodium 11 1s2 2s22p63s1
Magnesium 12 1s2 2s22p63s2
Aluminum 13 1s2 2s22p63s23p1
Silicon

14

1s2 2s22p63s23p2
Phosphorus 15 1s2 2s22p63s23p3
Sulfur 16 1s2 2s22p63s23p4
Chlorine 17 1s2 2s22p63s23p5
Argon 18 1s2 2s22p63s23p6
Period 4
Potassium 19 1s2 2s22p63s23p64s1
Calcium 20 1s2 2s22p63s23p64s2

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section 4.8 arrangement of electrons in Sublevels ..p95

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