What is principal quantum number?
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The principal quantum number is a positive integer denoted by 'n' that determines the size, shell and to a large extent, the energy of the orbital.
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→A total of four quantum numbers are used to describe completely the movement and trajectories of each electron within an atom. ... In other words, it refers to the size of the orbital and the energy level an electron is placed in. The number of subshells, or l, describes the shape of the orbital.
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