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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.
As you know, a total of four quantum numbers are used to describe the positions and the spin of an electron in an atom. In your case, you must decide which possible values can be assigned to the fourth quantum number of an electron that resides in a #2s^2# orbital. The principal quantum number describes the energy level, or shell, on which the electron resides. In this case, the electron is located on the second energy level, so #n=2#.