The unified atomic mass unit, also called the dalton (symbol: Da), is a unit used for indicating mass on an atomic or molecular scale. It is defined as one twelfth of the rest mass of an unbound atom ...

IN the review of “A New View of the Origin of Dalton's Atomic Theory,” published in your issue of April 16, your reviewer, in summing up the evidence as to the origin of the atomic theory ...

Berzelius describes his well-known system of chemical symbols without making any mention of the fact that Dalton had more thaa ten years previously introduced true atomic symbols and used them for ...

His groundbreaking atomic theory, introduced in the early 19th century, proposed that matter is composed of indivisible particles called atoms. Each atom, according to Dalton, has a unique weight ...