Since it was first synthesized in a post-WW2 American lab in 1949, berkelium has been a rebel of the periodic table, defying quantum mechanics and taking on an extra positive charge that its relatives ...

As you move down a group in the periodic table, the covalent radius increases ... screen or shield the outer electrons from the nuclear charge.

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 ...

The periodic table is a way of arranging elements according ... And he did this by showing that the positive charge in the atom wasn’t spread out evenly and was in fact concentrated in the ...

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 ...

During the process, they discovered something unexpected about this particular f-block element on the periodic table that could ... oxidation state (a positive charge of +4) that’s stabilized ...

Want to learn more about this centerpiece of chemistry? Take your pick from this collection of links about elements and the periodic table! Build an element ball, solve periodic puzzles, and check out ...