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atomic number

noun
🔊/əˌtɒmɪk ˈnʌmbə(r)/
🔊/əˌtɑːmɪk ˈnʌmbər/
 (chemistry化学)
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  1. the number of protons in the nucleus (= centre) of an atom of a particular chemical element. Elements are placed in the periodic table according to their atomic numbers.原子序数（指原子在元素周期表中的序号）Topics Physics and chemistryc2