The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

The questions in this quiz are suitable for GCSE chemistry students studying the physical and chemical properties of group 0 elements (noble gases), group 1 elements (alkali metals) and group 7 ...

and produced several Periodic Tables between 1864-1870. His first table contained just 28 elements, organised by their valency (how many other atoms they can combine with). These elements were almost ...

A chemical element is one of those squares on ... It is positioned in group 7 of the periodic table because it has seven electrons in the outermost shell of electrons. The trouble is that chlorine ...

In this periodic table of elements quiz, you have 10 minutes to name as many elements as you can, given only their symbol, ...

The periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a little over 150 years. The handy visual reference guide organizes known ...

When the first periodic table was formulated by Mendeleev, it was the only group that contained just a single known element — manganese. In the early twentieth century, several claims were made ...