It happens all over the periodic table. The chemical symbol for lead is Pb. For mercury, Hg. For antimony, Sb. My chemistry teacher in high school cracked up every time she referred to the symbol ...

We learn the periodic table as the elements arranged according to the atomic number, which is an integer, a whole number. That's the number of protons in an atom of that element.

A table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.

Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications.

The periodic table stares down from the walls of just about every chemistry lab. The credit for its creation generally goes to Dimitri Mendeleev, a Russian chemist who in 1869 wrote out the known ...

Motörhead fans still mourning the death of the band's singer, songwriter and bassist, Ian 'Lemmy' Kilmister, in December are seeking commemoration for the rock icon in an unusual location — the ...

Scientists officially name two new elements on the periodic table: Flerovium and Livermorium.

Over 100,000 fans of Motörhead's Lemmy Kilmister have signed an online petition to lend the musician's name to a new heavy metal element in the periodic table.