Element Caesium (Cs), Group 1, Atomic Number 55, s-block, Mass 132.905. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Jump to main content

Interactive periodic table with element scarcity (SRI), discovery dates, melting and boiling points, group, block and period information.

Elements and Periodic Table History Iron objects have been found in Egypt dating from around 3500 BC. They contain about 7.5% nickel, which indicates that they were of meteoric origin.

Explore the periodic table of elements with your students using these innovative and interactive resources. Including games, wallcharts, info graphics and other engaging learning resources to help celebrate 2019 as the International Year of the Periodic Table

Discover the world of alchemy and the elements involved, as part of the Royal Society of Chemistry's Visual Elements Periodic Table

What's more, on moving across the periodic table, from group one with lithium, sodium, potassium etc to group two with beryllium, magnesium, calcium and so on, it becomes increasingly harder to remove the outermost electrons.

The Royal Society of Chemistry brings you the history of the elements and the periodic table: Explore each element to find out about its discovery and the scientists involved.

Rubidium is one of the alkaline metals, as group one of the periodic table are otherwise known. The alkali metals have a single electron in their outer shell, which makes them highly reactive with oxygen, water and halogens, and also means that their oxidation state never exceeds +1.

This could be used to follow up some work on the periodic table where the trends in reactivity in groups 1 and 7 have been identified. It can be used as a differentiated activity for the more able students within a group.

Our interactive periodic table includes a wealth of data, plus information about the history, common uses, properties and supply risk for each element, with links to podcasts and videos. You can also explore data trends across the periodic table or select individual groups or periods.