Since then, the periodic table has evolved to reflect over 150 years of scientific development and understanding in chemistry and physics. Today, with 118 known elements, it is widely regarded as one ...

You may use table navigation commands for the screen reader of your choice. The Periodic Table of Elements. Each entry contains the atomic number, chemical symbol, and atomic mass to two decimal ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

The table shows the melting points of five alkali metals. Use this information to describe how melting point changes in group 1.

The periodic table is one of the most iconic and recognizable symbols in all of science. It is a tabular arrangement of the elements, organized by their atomic structure and chemical properties ...

Elements in group 1 and group 2 are metals ... See the study guide on groups in the periodic table for more information.

remember that it is not just a chart of elements, but a blueprint for life itself. Content provided by Young Post is pleased to partner with Hong Kong Science Museum and Hong Kong Space Museum on ...

Well it's actually quite elemental—The Periodic Table of the Elements, that is. The whiz, bang, pop, and color are all possible by combining the most basic substances of which we know ...