The electron configuration of oxygen (atomic number 8) is 1s2 2s2 2p4
The noble gas form is [He] 2s22p4
1s2 2s2 2p4
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Oxygen tends to form O^2- ions, gaining two electrons to achieve a stable electron configuration. Fluorine tends to form F^- ions, gaining one electron to achieve an electron configuration similar to a noble gas.
The shorthand electron configuration of magnesium is [Ne]3s².
The longhand electron configuration for Sulfur is 1s2 2s2 2p6 3s2 3p4.
Sodium has the electron configuration of neon.
The element with the electron configuration 2 8 is oxygen, which has 8 electrons in total.