Mass-to-charge ratio refers to the molecular or atomic mass number and "z" to the charge number of the ion; however, the quantity of "m"/"z" is dimensionless by definition. An ion of 100 atomic mass units ("m" = 100) carrying two charges ("z" = 2) will be observed at "m"/"z" = 50. In the 19th century, the mass-to-charge ratios of some ions were measured by electrochemical methods. In 1897, the mass-to-charge ratio of the electron was first measured by J. J. Thomson. By doing this, he showed that the electron was in fact a particle with a mass and a charge, and that
Aonghus (given name) Aonghus (given name) Aonghas is a masculine given name in Irish and Scottish Gaelic. It is composed of Celtic elements meaning "one", and "choice". A variant spelling of the Scottish Gaelic name is "Aonghus". The Irish form of the Scottish Gaelic names is "Aengus". A pet form of the Scottish Gaelic names is "Angaidh", which is represented in English as "Angie", pronounced ""an-ghee"". The earliest form of the given name "Angus", and its cognates, occurs in Adomnán's "Vita Columbae" (English: ""Life of Columba"") as "Oinogusius", "Oinogussius". This name likely refers to a Pictish king whose name is recorded variously as