Dmitri Mendeleev
1. Dmitri Mendeleev ………(BE) a Russian scientist who created the periodic table.
2. He arranged the elements by ……. (ATOM) weight.
3. Mendeleev ………… (ORGANIZE) the elements into rows and columns.
4. The table showed ………..(REPEAT) patterns in the elements' properties.
5. He left gaps in the table, ……..(PREDICT) predicting the existence of undiscovered elements.
6. His ……….(PREDICT) were later proven correct, making the table even more important.
7. The periodic table is a ………… (FUNDAMENT) tool for chemists.
8. It …....(HELP) scientists understand the relationships between different elements.
9. The table has ………(SIMPLIFY) the study of chemistry.
10. Mendeleev's work was …………….(EXCEL).