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In this article, halfway between popularized exposition and historicalaccount, some key moments in the development of atomic theory in its beginningsare discussed. In particular, the events and the major discoveries that havehighlighted the discrete structure of the atom's energy levels are presented intheir logical and chronological sequence, starting from early studies on thedecomposition of light by prisms until the quantum theory.  ---  In questo articolo, a met\`a strada tra l'esposizione divulgativa e ilresoconto storico, vengono affrontati alcuni momenti significativi dellosviluppo della teoria atomica ai suoi primordi. In particolare, sonopresentati, nella loro sequenza logica e cronologica, gli avvenimenti e lescoperte principali che hanno messo in luce la struttura discreta dei livellidi energia dell'atomo, dai primi studi sulla scomposizione della luce coiprismi alla teoria quantistica.

La scala dell'energia