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- Slide: 1
- My results showed that frequency of the X-rays given off by an element was mathematically related to the position of that element in the Periodic table. The frequency isproportional to the charge of the nucleus, or the atomic number
- Henry Gwyn-Jeffreys Moseley was an English physicist who demonstrated that the atomic number, the number ofprotons in an atom, determines most of the properties of an element. He began his study of radioactivity in ErnestRutherford’s laboratory but later decided to explore more on X-rays.
- In 1940, Dale Corson, K. Mackenzie, and Emilio Segre discovered element with atomic number 85.
- In the 1930s, the heaviest element known was uranium, with an atomic number 92. Early in 1940, Edwin McMillan provedthat an element having an atomic number 93 could be created.
- Slide: 2
- I have showed that the nitrogen nuclei reacted to the alpha particles to form an oxygen nuclie.
- In 1919, Ernest Rutherford successfully carried out a nuclear transmutation reaction — a reaction involving thetransformation of one element or isotope into another element. He bombarded alpha particles from radium directed to thenitrogen nuclei.
- Slide: 3
- I bombarded molybdenum (Z=42) with fast-moving neutrons. Thenewly synthesized element was named Technetium (Tc) after the Greek word"technêtos" meaning “artificial.” Tc was the first man-made element.
- In 1937, American physicist Ernest Lawrencesynthesized element with atomic number 43 using a linear particle accelerator.
- Slide: 4
- We have bombarded atoms of bismuth (Z=83) with fast-moving alpha particles in a cyclotron.
- A cyclotron is a particle accelerator that uses alternating electric field to accelerate particles that move in a spiral path in the presence of a magnetic field. Element-85 was named astatine from the Greek word “astatos” meaning unstable.
- Slide: 5
- I used a particle accelerator to bombard uranium with neutrons and created an element with an atomic number 93 which I named neptunium.
- Slide: 6
- We have bombarded uranium with deuterons (particles composed of a proton and a neutron) in a cyclotron. Element-94 was named plutonium.
- At the end of 1940, element-94 was synthesized by Seaborg,McMillan, Kennedy, and Wahl.
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