ST. LOUIS -- When the Boston Red Sox signed Mike Napoli this past winter, there were a number of possible outcomes. He could hit a little, the way he had in 2012, putting up an OPS+ of 113. He could hit a lot, like he had in 2011, with a 173 OPS+ and 30 home runs. Most likely, he'd fall somewhere in between.
The fourth quantum number is the spin quantum number, s. There are only two values for s, +Â½ and -Â½. These are also referred to as 'spin up' and 'spin down'. This number is used to explain behavior of individual electrons as if they were spinning in a clockwise or counterclockwise.
Quantum number - Spatial and angular momentum numbers. 1  Four quantum numbers can describe an electron in an atom completely. 2  Principal quantum number (n) 3  Azimuthal quantum number (â) 4  Magnetic quantum number (m) 5  Spin quantum number (s) 6  The spin-orbital interaction, however, relates these numbers.