Aufbau principle

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• Aufbau principle — The Aufbau principle (from the German Aufbau meaning building up, construction : also Aufbau rule or building up principle) is used to determine the electron configuration of an atom, molecule or ion. The principle postulates a hypothetical… …   Wikipedia

• Aufbau principle — ▪ chemistry       (from German Aufbauprinzip, “building up principle”), rationalization of the distribution of electrons among energy levels in the ground (most stable) states of atoms. The principle, formulated by the Danish physicist Niels Bohr …   Universalium

• Aufbau — This article is about a German journal. For the principle in atomic physics, see Aufbau principle. First issue of the journal Aufbau is a journal for German speaking Jews around the globe. It was founded in 1934 and is a member of Internationale… …   Wikipedia

• Electron configuration — Electron atomic and molecular orbitals Simp …   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

• Electron shell — Periodic table with electron shells An electron shell may be thought of as an orbit followed by electrons around an atom s nucleus. The closest shell to the nucleus is called the 1 shell (also called K shell ), followed by the 2 shell (or L shell …   Wikipedia

• Transition metal — The term transition metal (sometimes also called a transition element) has two possible meanings: The IUPAC definition[1] states that a transition metal is an element whose atom has an incomplete d sub shell, or which can give rise to cations… …   Wikipedia

• 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

• Energy level — A quantum mechanical system or particle that is bound that is, confined spatially can only take on certain discrete values of energy. This contrasts with classical particles, which can have any energy. These discrete values are called energy… …   Wikipedia

• d electron count — The d electron count is a chemistry formalism used to describe the electron configuration of the valence electrons of a transition metal center in a coordination complex.[1][2] The d electron count is an effective way to understand the geometry… …   Wikipedia

• Molecular orbital diagram — A molecular orbital diagram, or MO diagram for short, is a qualitative descriptive tool explaining chemical bonding in molecules in terms of molecular orbital theory in general and the Linear combination of atomic orbitals molecular orbital… …   Wikipedia