The periodic table on the website of the International Union of Pure and Applied Chemistry avoids making a decision about whether La and Ac or Lu and Lr are group 3 elements.

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 ...

Groups in the periodic table. Part of Combined Science. Groups in the periodic table. Group 1 - the alkali metals - Edexcel. The group 1 elements are all soft, reactive metals with low melting points.

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.

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

If you are intimidated by the periodic table, then this introduction through the first column of elements will give you a feel for how and why the elements are arranged in this order.

Posted 08.09.12; NOVA; In this video ... Elements in a group, ... The periodic table can predict the properties of elements or the existence of yet-to-be discovered elements. ...