Niwclews atomig: Gwahaniaeth rhwng fersiynau

Bathwyd y term "niwclews" sy'n golygu "cnewyllyn cneuen" yn 1704. Ym 1844, defnyddiodd [[Michael Faraday]] y term i gyfeirio at "pwynt canolog yr atom." Cynigwyd yr ystyr gyfoes am un atomig gan [[Ernest Rutherford]] ym 1912.<ref>[http://www.etymonline.com/index.php?search=Nucleus&searchmode=none Nucleus – Online Etymology Dictionary]</ref> Ni fabwysiadwyd y term "niwclews" i theori atomig yn syth, er enghraifft ym 1916, fe ddywedodd [[Gilbert N. Lewis]] yn ei erthygl enwog ''The Atom and the Molecule''<ref>[{{Cite web |url=http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Lewis-1916/Lewis-1916.html |title='The Atom and the Molecule''] |access-date=2008-05-22 |archive-date=2007-09-18 |archive-url=https://web.archive.org/web/20070918004659/http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Lewis-1916/Lewis-1916.html |url-status=dead }}</ref>, fod "yr atom wedi'i gyfansoddi o ''gnewyllyn'' ac atom allanol neu ''blisgyn''".