LEARNit Dictionary
atomic number
noun
/əˌtɒmɪk ˈnʌmbə(r)/
UK
/əˌtɑːmɪk ˈnʌmbər/
US
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.
عدد اتمی