For hydrogen atoms, it is 1s1.
For hydrogen positive ions (protons), it is 1s0.
For hydride ions, it is 1s2 or [He]-.
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The electron configuration of hydrogen is 1s1, indicating that it has one electron in the s orbital of the first energy level.
The valency of hydrogen is +1 because it has a tendency to lose an electron while combining with an Elelment. This gives it a positive valency.
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 bond holding the diatomic molecule of hydrogen (which exists in hydrogen gas) is a single covalent bond. This is the sharing of one electron in their 1s orbital, forming an stable electron that of helium: 1s2