shell of electrons

См. также в других словарях:

• 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 atomic model — ▪ physics       simplified description of the structure of atoms that was first proposed by the physicists J. Hans D. Jensen (Jensen, J. Hans D.) and Maria Goeppert Mayer (Mayer, Maria Goeppert) working independently in 1949. In this model,… …   Universalium

• 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

• shell — /ʃɛl / (say shel) noun 1. a hard outer covering of an animal, as the hard case of a mollusc, or either half of the case of a bivalve mollusc. 2. any of various objects resembling a shell, as in shape, or in being more or less concave or hollow. 3 …  

• shell — noun 1》 the hard protective outer case of a mollusc or crustacean.     ↘the thin outer covering of a bird s or reptile s egg.     ↘the outer case of a nut kernel or seed.     ↘the carapace of a tortoise, turtle, or terrapin.     ↘the wing cases… …   English new terms dictionary

• shell — An outer covering. cytotrophoblastic s. the external layer of fetally derived trophoblastic cells on the maternal surface of the placenta. diffusion s. a small vessel made of a semipermeable membrane …   Medical dictionary

• shell nuclear model — ▪ physics       description of nuclei of atoms by analogy with the Bohr atomic model of electron energy levels. It was developed independently in the late 1940s by the American physicist Maria Goeppert Mayer (Mayer, Maria Goeppert) and the German …   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

• k-shell — ˈ ̷ ̷ˌ ̷ ̷ noun Usage: usually capitalized K : the innermost shell of electrons surrounding an atomic nucleus and constituting the lowest available energy level for the electrons compare l shell, m shell * * * /kay shel /, n. Physics. the first… …   Useful english dictionary