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lihtaine, mis omaduste poolest on metalli ja mittemetalli vahepealne aine (nt astaat, antimon)
element, millel on metalli kui ka mittemetalli omadused, nt arseen, lihtaine, mis omaduste poolest on metalli ja mittemetalli vahepealne aine (nt astaat, antimon), an element having both metallic and non-metallic properties, eg arsenic, silicon etc