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单词 atomic number
释义

WordReference Random House Learner's Dictionary of American English © 2024
aˈtom•ic ˈnum•ber, n. [countable]
  1. Chemistrythe number of protons in the nucleus of an atom of an element.

WordReference Random House Unabridged Dictionary of American English © 2024
atom′ic num′ber, 
  1. Chemistrythe 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

Collins Concise English Dictionary © HarperCollins Publishers::
atomic number n
  1. the number of protons in the nucleus of an atom of an element
    Abbreviation: at. no.
    Symbol: Z
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更新时间：2025/7/23 16:42:45