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 ...

This is the second part of a three-part series written by Carolyn Krause. Many of the elements were synthesized using an Oak ...

and we get 35.5 to one decimal place and that’s what you’ll see if you look for chlorine in the periodic table. So the relative atomic mass considers all the isotopes of an element.

This year we celebrate the 150 th anniversary of Mendeleev’s achievement in formulating the structure of the periodic table that we use today. He announced his structure in 1869, but the challenge of ...