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Atomic Structure Atomic number of an atom is the number of protons in the nucleus of an atom Mass number of an atom is the number of protons and the number of neutrons in the nucleus of one atom of the element Relative atomic mass (Ar) means the average mass of an atom of and element (Taking into account the natural occurrences of its isotopes) Compared to the mass of 1 Carbon 12 atom Mass Spectrometry Ionisation A sample is placed in the spectrometer and, if it is not in its gas phase then it has to be vaporised. The vaporised sample is bombarded by a stream of high energy electrons from a electron gun. These electrons can knock out a electron from its atom. Acceleration The positive ions are accelerated by an electric field and then focused into a beam of ions by passing the ions through a slit Deflection The beam of accelerated positive...

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