Explicație:
Z A P N E
clor.............cl............17........35.......18......17........17...+17
sulf..............s.............16.......32......16. .....16......16....+16
azot............n..............7.........14........7........7..........7.....+7
aluminiu....al............13........27.......14.......13......13....13
fluor............f..............9..........19.......10........9.. ....9....+9
potasiu......k.............19........39......20.......19......19.....+19....
oxigen.......o..............8.........16........8........8.......8.....+8
