what is meant by quantum number
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A quantum number is a value that is used when describing the energy levels available to atoms and molecules . An electron in an atom or ion has four quantum number to describe its state and yield solutions to the Schrödinger wave equation for the hydrogen atom.
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there are 4 types of quantum numbers
1)principal quantum number
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1)it represents the main shell to which an electron belong and also the approx energy , approx distance between the nucleus and an electron
2)it is represented by the letter 'n'
3)where 'n' =1 2 3 .............
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2)azimuthal quantum number
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1)it represents the subshell to which an electrons belong
2)it also determines the shape and angular momentum of electrons
3)it is represented by letter l
4)where l = (n-1)
5)it is also called as orbital angular momentum quantum number, orbital quantum number or second quantum number
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3)magnetic quantum number
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1)it represents the orientation of the atomic orbitals around the nucleus
2)it is represented by the letter 'm'
3)where no of values for m =( 2l +1)
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4)spin quantum number
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1)it says how do the electrons revolve around the nucleus weather clock wise or anti clockwise
2)it is represented by letter s
3)its values are +1/2 or -1/2
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