The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...
Two elements in group 1 of the periodic table are lithium and sodium. Very small pieces of lithium and sodium were reacted separately with water. In the periodic table, the group 7 elements and ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback