Ma'anar ƙamus na "atomic number 27" shine:Yawan protons a cikin tsakiya na atom na wani element mai lamba 27, wanda shine cobalt. Cobalt yana da protons 27 a cikin tsakiya, yana ba shi lambar atomic lamba 27. Lambar atomic na wani element yana ƙayyade matsayinsa akan tebur na lokaci-lokaci kuma yana daidai da adadin electrons a cikin tsaka-tsakin atom na wannan element.
