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The number of protons

См. также в других словарях:

  • Mass number — The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. Because protons and neutrons both are baryons, the mass number A is identical… …   Wikipedia

  • atomic number — the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. Abbr.: at. no.; Symbol: Z Also called proton number. [1815 25] * * * Number of a… …   Universalium

  • The Dark Energy Survey — DES logo The Dark Energy Survey (DES) is a survey that aims to probe the dynamics of the expansion of the universe and the growth of large scale structure. The collaboration is composed of research institutes and universities from United… …   Wikipedia

  • number — 1. A symbol expressive of a certain value or of a specific quantity determined by count. 2. The place of any unit in a series. atomic n. (Z) the n. of protons in the nucleus of an atom; it indicates the position of the …   Medical dictionary

  • atomic number —    The atomic number was originally defined (about 1865) simply as an index describing the position of an element in the periodic table. Not until 1913 was it known that the atomic number is actually a unit of measurement, equal to the number of… …   Dictionary of units of measurement

  • Atomic Number —    The number of protons in an atoms nucleus …   The writer's dictionary of science fiction, fantasy, horror and mythology

  • Mass Number —    The number of protons and neutrons in an atomic nucleus …   The writer's dictionary of science fiction, fantasy, horror and mythology

  • Effective atomic number — has two different meanings: one that is the effective nuclear charge of an atom, and one that calculates the average atomic number for a compound or mixture of materials. Both are abbreviated Zeff.For an atomThe effective atomic number Zeff,… …   Wikipedia

  • Atomic number — See also: List of elements by atomic number An explanation of the superscripts and subscripts seen in atomic number notation. In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the… …   Wikipedia

  • isotopic number — noun : the number of neutrons minus the number of protons in an atomic nucleus * * * Physics. the number of neutrons minus the number of protons in an atomic nucleus. * * * isotopic number noun The excess number of neutrons over protons in a… …   Useful english dictionary

  • atomic number — noun the order of an element in Mendeleyev s table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element • Hypernyms: ↑number • Hyponyms: ↑magic number * * * aˌtomic ˈnumber f13… …   Useful english dictionary

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