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 ...

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 ...

Mrs Roberts: Well, elements that have similar properties to each other are put into vertical columns called groups. Now, the table is called the periodic table because the elements with similar ...

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

There are repeating patterns in the properties of the elements, which give the periodic table its name. Elements with similar properties are arranged to form columns (groups). The periodic table ...

Group 7 of the periodic table is something of an oddity. When the first periodic table was formulated by Mendeleev, it was the only group that contained just a single known element — manganese.

Scientists have developed the first electrically pumped continuous-wave semiconductor laser composed exclusively of elements from the fourth group of the periodic table -- the 'silicon group'.

This year marks the 150th anniversary of the publication of Mendeleev’s Periodic Table of Chemical Elements in 1869. In celebration, the United Nations Educational, Scientific, and Cultural ...