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 ...

For elements in the first three periods of the periodic table (hydrogen - argon), the orbitals can simply be filled up by increasing energy energy level. A difficulty arises when we come to potassium.

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

Electronegativity, an essential characteristic of all elements in the periodic table, measures an atom's ability to attract electrons towards itself within a chemical bond. This vital theoretical ...

That’s why this periodic table clock really caught our eye. [gocivici]’s idea is a simple one: light up three different elements with ... a sense of time. The 3D printed frame of the clock ...

A further quandry arises when we examine the ionisation energies of the d-block elements. We find that it is the 4s orbital electrons that are ionised first before the 3d orbitals. We have to conclude ...