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 ...

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 ...

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.

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 .

Atoms in the same column (group) in the periodic table have the same number of valence electrons. Summary. Students will again focus on the first 20 elements. Students will first look at a diagram and ...