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Marie Curie and the Atomic Theory

explanatory Essay
1440 words
1440 words
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The Atomic Theory is a theory that explains what matter is made of. The Atomic theory states that matter can’t be divided as it is made up of minute particles called atoms that cannot be separated. The very word atom is derived from the Greek word Atmos which means indivisible.

Atomic theory timeline-
Year Person/People Event
442 BCE Democritrus and Leucippus These Greek philosophers came up with the idea that all matter is composed of indivisible elements.
1803 John Dalton British chemist and physicist John Dalton theorised that matter is composed of spherical atoms (that are in motion) of different weights and are combined in ratios by weight.
1896 Wilhelm Rontgen Discovered that certain chemicals glowed when exposed to cathode rays. These chemicals were special because they weren’t deflected by the magnetic field produced in the cathode ray tube (which was built by Sir William Crookes in 1870).
He Called these X-rays.
1896 Henri Becquerel Accidentally discovered spontaneous radioactivity.
1898 Pierre and Marie Curie Pierre and Marie hypothesised that radioactive particles cause atoms to break down, then release radiation that forms energy and subatomic particles.
1898 JJ Thomas Discovered the electron, using properties of cathode rays.
1900 Max Planck Introduced the quantum theory- stating that electromagnetic energy could only be released in quantized form.
His ‘quanta’ are now referred to by physicists as ‘photons.’
1905 Albert Einstein Created special and general theories of relativity and speculated upon the particle nature of light. This was the basis of understanding nuclear energy.
1908 Robert Millikan Measured the charge of an electron. The charge of one electron is known as the elementary charge.
1909 -- Ernest ...

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...ces are secondary sources, I had to be very careful that the websites that I chose contained reliable information and diagrams. I believe that I have been very careful with my sources and have chosen ones that are both accurate and informative and have helped me to develop my ideas about Marie Curie and the atomic theory in many ways.

Works Cited

http://www.softschools.com/timelines/atomic_theory_timeline/95/ http://www.nobelprize.org/nobel_prizes/themes/physics/curie/ http://www.buzzle.com/articles/accomplishments-of-marie-curie.html http://www.aip.org/history/exhibits/curie/resbr2.htm http://www.earthmagazine.org/article/benchmarks-henri-becquerel-discovers-radioactivity-february-26-1896 http://www.aps.org/publications/apsnews/200412/history.cfm http://www.nist.gov/pml/general/curie/1927.cfm
http://www.aip.org/history/curie/brief/03_radium/radium_2.html

In this essay, the author

  • Explains that the atomic theory states that matter can't be divided as it is made up of minute particles called atoms that cannot be separated.
  • Explains that greek philosophers came up with the idea that all matter is composed of indivisible elements.
  • Explains that john dalton theorized that matter is composed of spherical atoms of different weights and are combined in ratios by weight.
  • Explains that they discovered that certain chemicals glowed when exposed to cathode rays. these chemicals were special because they weren't deflected by the magnetic field produced in a cathedral tube.
  • Explains pierre and marie's hypothesis that radioactive particles cause atoms to break down, then release radiation that forms energy and subatomic particles.
  • Introduces the quantum theory, stating that electromagnetic energy could only be released in quantized form.
  • Explains that they created special and general theories of relativity and speculated upon the particle nature of light. this was the basis of understanding nuclear energy.
  • Explains that the charge of an electron is known as the elementary charge.
  • Explains how he developed the theory for the structure of the atom. he used a ‘gold foil’ experiment to prove the existence of atomic nucleus.
  • Explains the bohr atomic model, which consists of electrons orbiting around the nucleus.
  • Explains how electrons move in wave formation and develops the shrodinger equation that describes how the quantum state of a system changes with time.
  • Explains that the neutron component of the atomic nucleus allowed scientists to make synthetic elements in a laboratory.
  • Proposes a 'quark model' which describes elementary particles that have no substructure which means that they can't divide.
  • Narrates marie's marriage to pierre curie, an internationally known physicist, in 1895.
  • Opines that they have been very careful with their sources and have chosen ones that are both accurate and informative. they have developed their ideas about marie curie and the atomic theory.
  • Explains marie (sklodowska) curie was born in 1867 in warsaw and was interested in science from an early age. she travelled to paris to study mathematics and physics.
  • Explains marie curie's discovery of uranium rays, which allowed gases to conduct electricity. marie discovered that the strength of radiation depended on the interior of the atom itself.
  • Explains that marie and pierre curie were awarded the nobel prize in physics for their contribution to the understanding of radioactivity. in 1908, marie became the first woman to become a professor at the sorbonne.
  • Describes marie sklodowska-curie institute of oncology, founded the radium institute in warsaw in 1932. marie died in 1934 and her and pierre's remains were reburied in the pantheon.
  • Explains marie curie's work on radium, polonium, and uranium.
  • Opines that marie curie was an incredibly smart lady and her scientific accomplishments were revolutionary. they believe that if technology had been available, they would have been able to protect themselves better.
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