Different shells can hold different maximum numbers of electrons. Electrons occupy shells starting with the innermost one. They begin to occupy the next shell when a shell becomes full.

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 ...

Element 103 in the periodic table is called lawrencium. It was first synthesised in 1961 at what was ... The trouble began when yet another element, ytterbium, the one before lutetium, was assigned a ...

But this pretty, iridescent metal, found near the bottom of the periodic table, exhibits some extraordinary ... we would expect from the element's electron configuration. The type of magnetism ...