May 26, 2010
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Play2 shows the results of an experiment which led 1 to discover something. Identify 1 and tell us what he discovered using 2.
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Answer: Sir. JJ Thomson and the discovery of isotopes.
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2. Isotopes of Ne, the first evidence for isotopes of any stable element.
His experiment in 2 , is first example of mass spectrometry , and from this experiment he discovered “isotopes” of a stable element (in this case neon)
2. Discovery of neon isotopes
Parablous of neon.. lead to the discovery of two isotopes of Neon.. neon-20 and neon-22.. First example of mass spectrometry.
2 shows how otherwise stable elements can contain variations we call “Isotopes”.
The plate is the earliest example of mass spectrometry.
showing 2 different Neon isotopes in the parabolic curve paths they fall into on a photographic plate based on their mass after magnetic and electric fields are applied.
2 – Thomson’s separation of neon isotopes by their mass, thus leading to the first isotopes of a stable element (Also an example of Mass Spectrometry).
Thomson’s separation of neon isotopes by their mass was the first example of mass spectrometry
parabolas of neon
electrons and isotopes
2) Isotopes. Using 2, he concluded that Neon is of 2 isotopes
2. J.J Thomson discovered two isotopes of neon which are neon-20 and neon-22
led to discovery of Isotopes.
2. Discovery of electrons.
2. first evidence of isotopes of a stable element
I quote
“In 1913, as part of his exploration into the composition of canal rays, Thomson channelled a stream of ionized neon through a magnetic and an electric field and measured its deflection by placing a photographic plate in its path. Thomson observed two patches of light on the photographic plate (see image on right), which suggested two different parabolas of deflection. Thomson concluded that neon is composed of atoms of two different atomic masses (neon-20 and neon-22), that is to say of two isotopes. This was the first evidence for isotopes of a stable element; Frederick Soddy had previously proposed the existence of isotopes to explain the decay of certain radioactive elements.”
Mass Spectrometry. Separation of neon isotopes
In general,discovery of isotopes.
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