Ma'anar ƙamus na kalmar "atomic number 31" ita ce kamar haka:Atomic lamba 31 tana nufin adadin protons da aka samu a cikin tsakiya na atom na sinadarin gallium. Gallium yana da adadin atomic na 31, wanda ke nufin cewa dukkanin zarra na gallium suna da protons 31 a cikin nuclei. Lambar atomic wani muhimmin abu ne na sinadari, kuma yana ƙayyade kaddarorin sinadarai da halayen wannan sinadari. Gallium karfe ne mai laushi, mai silfa tare da ma'aunin narkewar 29.76°C (85.57°F) da wurin tafasa na 2,403°C (4,357°F). Ana amfani da shi a aikace-aikace daban-daban, gami da semiconductor, lantarki, da hoton likita.