So how has the periodic table been put together? Mrs Roberts: Well, the modern periodic table shows us all of the elements arranged in rows, which are called periods. It has changed a lot over the ...

In 1843, Leopold Gmelin worked with the Dobereiner’s system and developed a table of 55 elements that contained many of the similar relationships later found in the modern periodic table. Then in 1857 ...

The periodic table organizes chemical elements based on atomic weight, electron configurations, and chemical properties, ...

Is the periodic table hanging in your lab ... Lavoisier’s work in framing the principles of modern chemistry led future generations to regard him as a founder of the science. Before 1886, aluminum was ...

National Periodic Table Day, observed annually on February 7, honors one of the most significant achievements in scientific ...

Take your pick from this collection of links about elements and the periodic table! Build an element ball ... the connection of alchemy to modern day chemistry, and some fun activities to experience a ...