Each of the words in the puzzle begin and end with a letter for an element on the Periodic Table (see below).
| I | II | IIIb | IVb | Vb | VIb | VIIb | VIIIb |
| Ib | IIb | III | IV | V | VI | VII | 0 | |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| H |
|
|
| He | |||||||||||||
| Li | Be |
|
| B | C | N | O | F | Ne | ||||||||
| Na | Mg |
|
| Al | Si | P | S | Cl | Ar | ||||||||
| K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr |
| Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe |
Cs | Ba | La* | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn |
| Fr | Ra | Ac** | Rf | Db | Sg | Bh | Hs | Mt | 110 | 111 | 112 | 114 | 116 | 117 |
| ||
Lanthanides * | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | |||
| Actinides ** | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr | |||



