TAS

2-letter words 3

• ata highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
• asa very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
• taa hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite