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单词 atomic number
释义
atomic number

Physics
  • Symbol Z. The number of protons in the nucleus of an atom. The atomic number is equal to the number of electrons orbiting the nucleus in a neutral atom.


Chemistry
  • The number of protons in the nucleus of an atom. The atomic number is equal to the number of electrons orbiting the nucleus in a neutral atom.


Chemical Engineering
  • The number of protons in an atomic nucleus. The classification of elements is based on the increasing order of atomic number.


Geology and Earth Sciences
  • Chemical elements are composed of atoms, all of which are held together by electrical charges. Every atom has a relatively heavy nucleus that is composed of protons (with a positive charge) and neutrons (neutral particles). Orbiting the nucleus there are a number of exceptionally light electrons, whose negative charges balance the positive charge provided by the protons. The number of protons in the structure provides the atomic number; atoms having the same atomic number belong to the same chemical element.


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