Scientists’ ideas about atoms have changed over time. Today, they agree that atoms have a positively-charged nucleus made of protons and neutrons, and negatively-charged electrons that orbit the ...

118 elements and seven periods, though just one period of high school chemistry is enough to get confused by it. This week, we’re exploring the history behind the periodic table.

Naturally occurring superheavy elements beyond those listed in the periodic table could potentially explain why asteroid 33 Polyhymnia is so dense, new research suggests. When you purchase through ...

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 ...

Groups in the periodic table - AQA Synergy Chemical equations - AQA Synergy Calculations in chemistry - AQA Synergy Sample questions - Building blocks for understanding - AQA Synergy ...

An expanded periodic table shows where researchers expect elements 119 and 120 to be categorized if they are discovered. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news ...