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
Mina (given name) Mina (given name) Mina is a given name with a variety of origins, used as a feminine name in some cultures and a masculine name in others. Mina (; ), also transcribed Mena or Meena, is a male given name for Egyptian Christians. Meena (Arabic: mīnā' مِينَاء) is the irregular feminine noun for port. See Mina (disambiguation) Meena or Mina is an Indian tribe. Meena, or Mina, is a name given to females in India. It is commonly used by Christians, Hindus and Parsees. The name is a shortened form of Meenakshi (beautiful fish-shaped eyes; Meen = fish; akshi =