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Answer: Quantum numbers are used to describe the position of an electron in an atom. Explanation: Quantum numbers can be used to describe the exact location of an electron. There are four quantum numbers: n - describes the energy level. â - describes the subenergy level (0 to n-1 ) mâ - describes the orbital ( -â to +â ) ms - describes the spin (clockwise or anti clockwise : -Â½ or +Â½) Ramith Hettiarachchi Â· Â· 22 comments Â· Jun 23 2014.
The spin quantum number, also known as the fourth quantum number, is a number value that describes the orientation of an electron occupying an orbital. The symbol that we will use for the spin quantum number is ms. Let's visualize the spin quantum number. The value of ms=+1/2 is shown by an arrow pointing upwards and is also said to be spin up. The value of ms=-1/2 is shown by an arrow pointing downwards and is also said to be spin down.