the spin quantum number has values+1212 of -1212 describes the trends in ionic size.
spin quantum is denoted by (s) as it represents the electronic configuration of the atom and the ionic size also depends on the electronic configuration of the sub-shells of the atom like l, m, n, s.
ionic size increases as the electronic configuration increases because the electron adds as we move up to a higher atomic number
all the other quantum numbers may vary from atom to atom but the spin quantum number remains either +1212 or -1212. it also describes the orientation of the electrons in an atom and the axis of electrons in an atom.
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