thallium-lead alloy
21Magnesium — Not to be confused with Manganese. sodium ← magnesium → aluminium Be ↑ Mg ↓ Ca …
22Niobium — zirconium ← niobium → molybdenum V ↑ Nb ↓ Ta …
23Titanium — This article is about the chemical element. For other uses, see Titanium (disambiguation). scandium ← titanium → vanadium …
24Chromium — This article is about the chemical element. For other uses, see Chromium (disambiguation). vanadium ← chromium → manganese ↑ Cr ↓ Mo …
25Platinum — This article is about the chemical element. For other uses, see Platinum (disambiguation). iridium ← platinum → gold Pd ↑ Pt ↓ Ds …
26Silicon — Not to be confused with the silicon containing synthetic polymer silicone. aluminium ← silicon → phosphorus C ↑ Si ↓ Ge …
27chemistry — /kem euh stree/, n., pl. chemistries. 1. the science that deals with the composition and properties of substances and various elementary forms of matter. Cf. element (def. 2). 2. chemical properties, reactions, phenomena, etc.: the chemistry of… …
28Rhenium — tungsten ← rhenium → osmium Tc ↑ Re ↓ Bh …
29Plomb — Pour les articles homonymes, voir Plomb (homonymie) et Pb.  Pour l’article homophone, voir Plon …
30Mercury poisoning — Classification and external resources Elemental mercury ICD 10 T …
