There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...

organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number. Scientists use the periodic table to quickly refer to information ...

nonmetallic element that helps protect metal surfaces from corrosion. Atomic number 15, atomic weight 30.9738. Sulfur (S): Sulfur is a nonmetallic element found mainly in volcanic and sedimentary ...

You're listening to Chemistry in its element brought to you by Chemistry World, the magazine of the Royal Society of Chemistry. There aren't many elements with names that are onomatopoeic. Say 'oxygen ...

Atoms of different elements usually have different mass numbers, but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40. The atomic number of a ...