a (atomic weight)
71Atomic orbital — The shapes of the first five atomic orbitals: 1s, 2s, 2px, 2py, and 2pz. The colors show the wave function phase. These are graphs of ψ(x,y,z) functions which depend on the coordinates of one electron. To see the elongated shape of ψ(x,y,z)2… …
72atomic physics — Scientific study of the structure of the atom, its energy states, and its interaction with other particles and fields. The modern understanding of the atom is that it consists of a heavy nucleus of positive charge surrounded by a cloud of light,… …
73atomic clocks — Clock Clock (kl[o^]k), n. [AS. clucge bell; akin to D. klok clock, bell, G. glocke, Dan. klokke, Sw. klocka, Icel. klukka bell, LL. clocca, cloca (whence F. cloche); al perh. of Celtic origin; cf. Ir. & Gael. clog bell, clock, W. cloch bell. Cf.… …
74atomic theory — noun Date: 1814 1. a theory of the nature of matter: all material substances are composed of minute particles or atoms of a comparatively small number of kinds and all the atoms of the same kind are uniform in size, weight, and other properties 2 …
75equivalent weight — noun the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen • Syn: ↑equivalent, ↑combining weight, ↑eq • Hypernyms: ↑atomic mass, ↑atomic weight, ↑relative atomic… …
76List of fictional elements, materials, isotopes and atomic particles — This list contains chemical elements, materials, isotopes or (sub)atomic particle that exist primarily in works of fiction (usually fantasy or science fiction). No actual periodic elements end in ite , though many minerals have names with this… …
77Equivalent weight — is the amount of an element that reacts, or is involved in reaction with, 1 mole of electrons. It is defined by many texts as the weight of the element combining with 1 g hydrogen, 8 g oxygen or 35.5 g chlorine, each of which would either provide …
78relative atomic mass — noun (chemistry) the mass of an atom of a chemical element expressed in atomic mass units • Syn: ↑atomic mass, ↑atomic weight • Topics: ↑chemistry, ↑chemical science • Hypernyms: ↑m …
79combining weight — noun the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen • Syn: ↑equivalent, ↑equivalent weight, ↑eq • Hypernyms: ↑atomic mass, ↑atomic weight, ↑relative atomic… …
80chemical atomic weights — Element El e*ment, n. [F. [ e]l[ e]ment, L. elementum.] 1. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based. [1913 Webster] 2. One of the… …
