LEARNit Dictionary
atomic theory
noun
/əˌtɒmɪk ˈθɪəri/
UK
/əˌtɑːmɪk ˈθiːəri/
US
1
the theory that all elements are made up of small particles called atoms, which are made up of a central nucleus surrounded by moving electrons
نظریه اتمی, تئوری اتمی, نظریه ساختار اتمی