__1803: __English chemist-physicist John Dalton starts using symbols to represent the atoms of different elements. Dalton, considered the father of modern atomic theory, made a logbook entry that day ...

Mrs Roberts: What do you think you're made of? Mr Spellman: Big question. Grit, determination, hard-working, handsome, charming, funny. Mrs Roberts: Well, I guess. But you're actually made of atoms.

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An element's atomic number defines it. An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So ...

Speaking of the "periodic table" in which elements are arranged in atomic number order, there are many people who have experienced rote memorizing with "militia Ribe my ship ....." mysterious spells.

The heaviest recognized chemical element with the atomic number 112 was discovered at the GSI Helmholtzzentrum für Schwerionenforschung and -- since February 19, 2010, -- officially carries the name ...

Tellurium is a metalloid element with the chemical symbol Te and atomic number 52. It is used primarily in iron, copper and lead alloys in and around the machining processes. When added to stainless ...

Mercury, also called quicksilver, is a chemical element in the periodic table that has the symbol Hg and atomic number 80. A heavy, silvery, transition metal, mercury is one of five elements that are ...

Magnesium is a silvery-white chemical element with the symbol Mg and atomic number 12. Magnesium alloys contain magnesium as the chief metal along with alloy elements such as lead, aluminum, zinc, and ...