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a chemistry period

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  • Chemistry (band) — CHEMISTRY redirects here. For the field of science, see Chemistry. Chemistry Also known as Kemi Origin Japan Genres Pop, R B Years active 2001–present …   Wikipedia

  • chemistry — /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… …   Universalium

  • Period 1 element — A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the… …   Wikipedia

  • Period 2 element — A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the… …   Wikipedia

  • Chemistry (etymology) — In the history of science, the etymology of the word chemistry is a debatable issue. It is agreed that the word derives from the word alchemy, which is a European one, derived from the Arabic al kīmīā (الكيمياء). The Arabic term is derived from… …   Wikipedia

  • period — pe·ri·od (pîr’ē əd) n. 1. An interval of time characterized by the occurrence of a certain condition, event, or phenomenon: »a period of economic prosperity. 2. An interval of time characterized by the prevalence of a specified culture, ideology …   Word Histories

  • period — /ˈpɪəriəd / (say pearreeuhd) noun 1. an indefinite portion of time, or of history, life, etc., characterised by certain features or conditions. 2. any specified division or portion of time. 3. Education a specific length of time in a school… …  

  • period — noun 1》 a length or portion of time.     ↘a major division of geological time that is a subdivision of an era and is itself subdivided into epochs. 2》 each of the set divisions of the day in a school. 3》 (also menstrual period) a monthly flow of… …   English new terms dictionary

  • Chemistry of biofilm prevention — Biofilm formation occurs when free floating microorganisms attach themselves to a surface. They secrete extracellular polymers that provide a structural matrix and facilitate adhesion. Because biofilms protect the bacteria, they are often more… …   Wikipedia

  • Organometallic chemistry — n Butyllithium, an organometallic compound. Four lithium atoms are shown in purple in a tetrahedron, and each lithium atom is bound to a butyl group (carbon is black, hydrogen is white). Organometallic chemistry is the study of chemical compounds …   Wikipedia

  • List of chemistry topics — This page aims to list articles related to chemistry. This is so that those interested in the subject can monitor changes to the pages by clicking on Related Changes in the sidebar and on the bottom of the page.This list is not necessarily… …   Wikipedia

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