Mendeleev discovered the periodic table (or Periodic System, as he called it ... certain types of element regularly occurred. For example, a reactive non-metal was directly followed by a very reactive ...

The periodic table captures a subtle pattern that runs ... Lithium, for example, with an atomic number of 3, is a reactive metal — just like sodium (element number 11) and potassium (number ...

Copper has been used by humans for as much as 7000 years and elements such as gold, silver, tin, lead and mercury have been known for many thousands of years. However, the first scientific ...

Lithium batteries are in the news constantly. But lithium has plenty of other uses. It's a drug for bipolar disorder. It used ...

These elements, chemically more reactive than flerovium ... This research fills critical gaps in the periodic table, offering new insights into the structure and behavior of these elements.

Like all noble gases, xenon is colourless, odourless and inflammable — but it is also more reactive ... elements of group 18 have lived in relative obscurity. In 1869, Mendeleev's first periodic ...