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 ...

The seventh row of the table was completed in 2016 when Tennessine, Nihonium, Moscovium, and Oganesson were added. Elements ...

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 ...

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

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can come top in our periodic table quiz. The periodic table of elements is a ...

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

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 ...