Show that there can be 18 electrons in a "g" subshell
Simple mnemonic: each orbital, s, p, d and f, has double the consecutive odd numbers of electrons, i.e. 1, 3, 5 &amp; 7 --> 2, 6, 10 &amp; 14.

BTW, from spectroscopy, s, p, d &amp; f refer to splitting of lines, the sharp, principal, diffuse and fine; see Atomic orbital. As Tom Lehrer stated, "These are the only ones of which the news has come to Hahvahd, and there may be many others, but they haven't been discovahd." Although element 121, unbiunium, begins the theoretical g-block...