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 ...

A new version of the periodic table arranges elements by protons instead of electrons. Because the old one was getting pretty stale.

GCSE Chemistry (Single Science) Atomic structure and the periodic table learning resources for adults, children, parents and teachers.

The table starts with the simplest atom, hydrogen, and then organizes the rest of the elements by atomic number, which is the number of protons each contains.

But arguably the most boring aspect was memorizing the periodic table–and all its damn elements, symbols, and atomic numbers. Now one Los Angeles company plans to spice up the periodic table ...

With the discoveries now confirmed, "The 7th period of the periodic table of elements is complete," according to the International Union of Pure and Applied Chemistry.

Most elements on the periodic table have at least one stable form. But some don’t. Here’s how long those unstable members endure.

Today, the periodic table is organized by atomic number, which is the number of protons in the nucleus. But they didn’t know about protons then, so they organized everything by atomic weight.

Four synthetic elements on the periodic table received their new names and atomic symbols, chemistry’s international standards organization announced Wednesday.

The asteroid named 33 Polyhymnia is so dense that researchers theorize that it may be made up of elements not contained on the periodic table.