periodic sample
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periodic law — /pear ee od ik, pear /, Chem. 1. the law that the properties of the elements are periodic functions of their atomic numbers. 2. Also called Mendeleev s law. (originally) the statement that the chemical and physical properties of the elements… … Universalium
Periodic boundary conditions — In molecular dynamics, periodic boundary conditions (PBC) are a set of boundary conditions used to simulate an effectively infinitely tiled system, usually applied to systems consisting of one or more macromolecules in a bath of explicit solvent … Wikipedia
Periodic boundary conditions — Condition périodique aux limites Pour les articles homonymes, voir CPL et PBC. En simulation numérique, et plus particulièrement en chimie, les conditions périodiques aux limites (CPL, en anglais periodic boundary conditions PBC) constituent un… … Wikipédia en Français
The Periodic Table (book) — Infobox Book name = The Periodic Table title orig = Il sistema periodico translator = Raymond Rosenthal image caption = Paperback cover published by Abacus. author = Primo Levi illustrator = country = United Kingdom publisher = Abacus release… … Wikipedia
National Electrical Code — The National Electrical Code, 2008 edition The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment. The NEC, while having no legally binding regulation as… … Wikipedia
Carnegie International — The Carnegie International is the oldest North American exhibition of contemporary art from around the globe. It was first organized at the behest of industrialist and philanthropist Andrew Carnegie in 1896. Carnegie established the International … Wikipedia
spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… … Universalium
Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… … Universalium
Alkali metal — Group → 1 ↓ Period 2 3 Li 3 … Wikipedia
chemical bonding — ▪ chemistry Introduction any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another … Universalium
Timeline of chemical elements discoveries — The discovery of the elements known to exist today is presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element,[clarification needed] as the exact date of discovery… … Wikipedia
