essential trace element

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• trace element — n a chemical element present in minute quantities esp one used by organisms and held essential to their physiology compare MICRONUTRIENT (2) * * * an element that is required in minute concentrations for normal growth and development. Trace… …   Medical dictionary

• trace element — n. 1. a chemical element, as iron, copper, zinc, etc., essential in plant and animal nutrition, but only in minute quantities 2. any element present in minute quantities in an organism, soil, water, etc …   English World dictionary

• trace element — noun Date: 1932 a chemical element present in minute quantities; especially one used by organisms and held essential to their physiology …   New Collegiate Dictionary

• transition element — Chem. any element in any of the series of elements with atomic numbers 21 29, 39 47, 57 79, and 89 107, that in a given inner orbital has less than a full quota of electrons. Also called transition metal. [1920 25] * * * Any chemical element with …   Universalium

• element — [n1] essential feature aspect, basic, basis, bit, component, constituent, detail, drop, facet, factor, fundamental, hint, ingredient, item, material, matter, member, part, particle, particular, piece, portion, principle, root, section, stem,… …   New thesaurus

• element — noun 1) an essential element of the game Syn: component, constituent, part, section, portion, piece, segment, bit; aspect, factor, feature, facet, ingredient, strand, detail, point; member, u …   Thesaurus of popular words

• element — noun 1) an essential element of the local community Syn: component, constituent, part, section, portion, piece, segment, aspect, factor, feature, facet, ingredient, strand, detail, member 2) …   Synonyms and antonyms dictionary

• element — 1. A substance composed of atoms of only one kind, i.e., of identical atomic (proton) number, that therefore cannot be decomposed into two or more elements and that can lose its chemical properties only by union with some other e. or by a nuclear …   Medical dictionary

• chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

• Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of …   Wikipedia

• Group 7 element — Group → 7 ↓ Period 4 25 Mn 5 …   Wikipedia