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 years as we've learned more and more about atoms.

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

118 Elements and Their Symbols and Atomic Numbers ... The periodic table that we follow for our studies is the Modern Periodic Table, which is based on atomic number rather than atomic mass.

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 ...

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

Take your pick from this collection of links about elements and the periodic table! Build an element ball, solve periodic puzzles ... This collection of links explores the history of alchemy, the ...

Einsteinium-255, produced through irradiation in ILL’s high-flux reactor, provided a continuous supply of fermium-255, ...