Back Tabla periodica de Mendeleyev AN عناصر مندلييف المتوقعة Arabic Elfennau disgwyliedig Mendeleev Welsh Mendeleev's predicted elements English La profetitaj elementoj de Mendelejev Esperanto Elementos predichos por Mendeléyev Spanish عناصر پیشبینیشده توسط مندلیف Persian Éléments prédits par Mendeleïev French मेंडलीफ के पूर्वानुमानित तत्व Hindi Mendeljejevi predviđeni elementi Croatian
In 1869, Professor Dmitri Mendeleev created the first periodic table of chemical elements. He arranged the elements from the lightest one to the heaviest one.[1] When he proposed his periodic table, he placed empty spaces between some elements. He said that the empty spaces were for undiscovered elements. Mendeleev had also predicted the properties of these undiscovered elements.
- ↑ Kaji, Masanori (2002). "D.I.Mendeleev's concept of chemical elements and The Principles of Chemistry" (PDF). Bulletin for the History of Chemistry. 27: 4–16. Archived from the original (PDF) on 2008-12-17. Retrieved 2013-03-12.