Various notations appear in older sources were used, such as Ne(22) in 1934,[1]: 226  Ne22 for neon-22 (1935)[2] or Pb210 for lead-210 (1933)[3]: 7 

You kids and your newfangled notations *shakes fist at heaven*

I had some really old physics books when I went to school … and that has been a while.