Explanation: Mass spectrometers are used to determine the relative mass of atoms and molecules. Aston made the instrument more accurate.

Explanation: J.J Thompson introduced mass spectrometers. Aston modified the instrument to make it more accurate.

Explanation: In mass spectrometer, the sample which is to be analysed is bombarded with electrons. As a result, ions are produced.

Explanation: Mass spectrometer separates ions on the basis of mass to charge ratio. Most of the ions are singly charged. Hence, the mass to charge ratio is equal to the mass.

Explanation: In mass spectrometer, the ions are sorted out by accelerating them through an electric and magnetic field. A record of number of different kinds of ions is called mass spectrum.

Explanation: No two molecules will be fragmented and ionized in exactly the same manner. This is how different molecules are identified in a complex mixture.

Explanation: The procedure for mass spectroscopy starts with converting the sample into a gaseous state. This is done by chemical processes.

Explanation: The ion currents are measured using a sensitive electrometer tube. The ions reaching the collecting plate are measured.

Explanation: Positive ions of specific mass pass through the slit and reach the collecting plate. These ions are measured.

Explanation: Impurities of masses different from the one being analysed does not interfere with the result in mass spectroscopy. This is a major advantage of this technique.

Explanation: The sample gas is introduced into the highly evacuated spectrometer tube and it is ionised by an electron beam. The sample has to be in a gaseous state.