atom shell

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• Atom — • Primarily, the smallest particle of matter which can exist Catholic Encyclopedia. Kevin Knight. 2006. Atom     Atom     † …   Catholic encyclopedia

• shell — less, adj. shell like, adj. /shel/, n. 1. a hard outer covering of an animal, as the hard case of a mollusk, or either half of the case of a bivalve mollusk. 2. any of various objects resembling such a covering, as in shape or in being more or… …   Universalium

• shell — [shel] n. [ME schelle < OE sciel, akin to MDu schelle < IE base * (s)kel : see SHELF] 1. a hard outer covering, as of a turtle, mollusk, insect, egg, fruit, seed, etc. 2. something like or suggestive of a shell in being hollow, empty, or… …   English World dictionary

• shell number — shell number, the number of shells of a given atom …   Useful english dictionary

• atom — /at euhm/, n. 1. Physics. a. the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical… …   Universalium

• Atom — The atom is the smallest unit of an element that retains the chemical properties of that element. An atom has an electron cloud consisting of negatively charged electrons surrounding a dense nucleus. The nucleus contains positively charged… …   Wikipedia

• shell — Synonyms and related words: Eustachian tube, L, R, acting area, aim at, alveolation, alveolus, ante up, antrum, anvil, apron, apron stage, armadillo shell, armature, armor, armor plate, armpit, atom, atomic model, attack, auditory apparatus,… …   Moby Thesaurus

• atom — Synonyms and related words: Bohr atom, Dirac atom, I, Lewis Langmuir atom, Thomson atom, ace, acid, acidity, agent, air, alkali, alkalinity, alloisomer, anion, antacid, atomic model, atomic particles, atoms, base, biochemical, bit, brute matter,… …   Moby Thesaurus

• Shell model — In nuclear physics, the nuclear shell model is a model of the atomic nucleus which uses the Pauli principle to describe the structure of the nucleus in terms of energy levels. The model was developed in 1949 following independent work by several… …   Wikipedia

• shell — n. & v. n. 1 a the hard outer case of many marine molluscs (cockle shell). b the esp. hard but fragile outer covering of a bird s, reptile s, etc. egg. c the usu. hard outer case of a nut kernel, seed, etc. d the carapace of a tortoise, turtle,… …   Useful english dictionary

• shell — I. noun Etymology: Middle English, from Old English sciell; akin to Old English scealu shell, Old Norse skel, Lithuanian skelti to split, Greek skallein to hoe Date: before 12th century 1. a. a hard rigid usually largely calcareous covering or… …   New Collegiate Dictionary