toxic element

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• toxic — 01. The chemicals from the factory are quite [toxic], and present a serious danger for human health. 02. The cost of cleaning up [toxic] waste should be paid by the companies that are responsible for the pollution. 03. It is difficult to… …   Grammatical examples in English

• element — 01. One of the key [elements] in our plan is a new advertising campaign. 02. There are 109 different [elements] in the Periodic Table in chemistry. 03. Aristotle believed that the universe is composed of 4 [elements]: earth, air, fire and water.… …   Grammatical examples in English

• Toxic metal — Toxic metals are metals that form poisonous soluble compounds and have no biological role, i.e. are not essential minerals, or are in the wrong form[1]. Often heavy metals are thought as synonymous, but lighter metals also have toxicity, such as… …   Wikipedia

• toxic — TOXÍC, Ă, toxici, ce, adj., s.n. 1. adj. Care poate intoxica, otrăvi; otrăvitor. 2. Otravă. – Din fr. toxique. Trimis de RACAI, 07.12.2003. Sursa: DEX 98  Toxic ≠ antitoxic, atoxic, netoxic Trimis de siveco, 03.08.2004. Sursa: Antonime  TÓXIC… …   Dicționar Român

• Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn …   Wikipedia

• nitrogen group element — ▪ chemical elements Introduction  any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …   Universalium

• rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …   Universalium

• Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …   Wikipedia

• actinide element — ▪ chemical element group Introduction       any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103). As a group they are significant largely because of their radioactivity.… …   Universalium

• zinc group element — ▪ chemistry Introduction  any of the three metals that comprise Group 12 (IIb) of the periodic table of elements namely, zinc (Zn), cadmium (Cd), and mercury (Hg). (See Figure >.) They have properties in common, but they also differ in… …   Universalium

• oxygen group element — ▪ chemical element Introduction also called  chalcogen,    any of the five chemical elements making up Group 16 (VIa) of the periodic classification namely, oxygen, sulfur, selenium, tellurium, and polonium. (See Figure >.) A relationship among… …   Universalium