| NITROGENOUS | Containing the element N |
| OXYACID | Corrosive substance containing the element O |
| MERCURIC | Containing the element Hg |
| NIOBATE | A salt containing the element with atomic number 41 (7) |
| BRIMSTONE | Old name for the element sulphur, whose yellow colour matches that of the wings of the male lepidopteran in the genus Gonepteryx rhamni, the original "butter-coloured fly" (9) |
| ATOM | (physics and chemistry) The smallest component of an element having the chemical properties of the element. |
| MERCURY | Named after a talaria-wearing swift-flying Roman messenger god, the first planet from the Sun or, the element with the symbol Hg (7) |
| IRIDIUM | The element was discovered in 1803 in the acid-insoluble residues of platinum ores by the English chemist Smithson Tennant. The international prototype standard kilogram of mass is made from an alloy |
| NITRIDE | Compound of the element with the symbol N with a more electropositive element (7) |
| ARSENIC | Featuring in the title of a play adapted into a film by Frank Capra, the element with germanium to its left and selenium to its right on the periodic table (7) |
| THALLIUM | Derived from the Greek meaning "green twig" in reference to its green spectral line, the element with the atomic number 81 (8) |
| SOUL | The element of humanity the Little Mermaid wants more than the prince (4) |
| CUPS | One of the four suits of the Minor Arcana in tarot, associated with the element of water (4) |
| MOG | A tattle, imitative of the chatter of a pie; the pyot itself; a halfpenny; a long-tailed titmouse; or, in short, a glossy or the element with atomic no. 12 (3) |
| AZOTH | The alchemical name for the element mercury (5) |
| UNS | The symbol for the element unnilseptium (3) |
| AG | The symbol for the element silver (2) |
| LEAD | The element identified by the circled letters |
| CHUCKNORRIS | Actor who supposedly "destroyed the periodic table, because he only recognizes the element of surpri |
| AURI | Prefix signifying the element at the heart of this puzzle's theme |
