Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications.

This year is the International Year of the Periodic Table of Chemical Elements—and today (March 6), the modern version celebrates its 150 th birthday.. To find out more about the table and how ...

Groups of the Periodic table. Alkali metals: The alkali metals make up most of Group 1, the table's first column. Shiny and soft enough to cut with a knife, ...

Ever wondered what makes Hydrogen number 1 on the periodic table? There's a reason. Discover the intelligent design of the periodic table with BBC Bitesize.

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 ...

Magnesium and calcium are in group 2 of the periodic table. They are less reactive than the metals in group 1. Calcium reacts with water to form calcium hydroxide, Ca(OH) 2 , and hydrogen, H 2 .