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The 1s orbital is closest orbital to nucleus in an atom. It can hold up to two electrons and has spherical shape.
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Electron Configuration: The distribution of electrons in an atom or molecule's electron shells.
Quantum Numbers: These are set of four numbers that describe the unique quantum state of an electron in an atom.
Pauli Exclusion Principle: This principle states that no two electrons can have identical quantum mechanical states in the same atom.