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The discovery of radioactivity. (n.d.). Retrieved September 28, 2017, from http://www.lbl.gov/abc/wallchart/chapters/03/4.html

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Who is Henri Becquerel? Everything You Need to Know. (n.d.). Retrieved September 28, 2017, from https://www.thefamouspeople.com/profiles/antoine-henri-becquerel-3838.php

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The Curies. (n.d.). Retrieved September 28, 2017, from http://www.nde-ed.org/EducationResources/HighSchool/Radiography/curies.htm

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Of all three contributions, Henri was the first to start his experiment. Once he finished and word got around, the Curies' were intrigued by Becquerel's findings and decided to tag onto what he found

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Discovery of the Nucleus: Rutherford's Gold Foil Experiment

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Demonstrated that atoms were made up of a charged nucleus orbited by electrons. He published his findings in 1911 with a description of what he called the Rutherford model of the atom. While electrons had been described prior to this experiment, Rutherford was the first person to describe the existence of a small, charged atomic nucleus.

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In 1911, Ernest Rutherford and his colleagues discovered the nucleus of the atom using their famous gold foil experiment. They shot alpha particles at a sheet of gold foil, and noticed that most went through, but some bounced back

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August 30, 1871- October 19, 1937

Rutherford made his discovery well after Marie and Henri

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Decmember 15, 1852-
August 25, 1908
Henri dedicated his life to the discovery of atoms alongside the Curies

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1867- Marie Curie is born
1895- Marie and Pierre get married
1998- After studying Uraninum for years, Marie and her husband created Polonium
1989, Dec- announced the existnece of a new element called radium
1901- Suggested that radioactivity occured because of changes taking place inside the atom
1903- The Curies are rewarded the Nobel Prize
1906- Pierre is killed by a horse drawn cariage
1934- Marie died in France

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In 1898, they discovered two new elements - polonium and radium. Polonium was named after Marie's homeland, Poland. Radium got its name from the Latin word for ray.

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The Curies' suspected that a uranium ore contained other radioactive elements- they named it radium

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Marie- November 7, 1876- 1934
Pierre- May 15,1859- 1906

They both investigated Henri's phenomenon in 1889

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1852- Henri was born. Father was a scientist and employed as a professor of Applied physics. He belonged to a family of scholars and scientists
1872- Henri joined the premier Frech government instituiton to study engineering. Graduated 2 years later
1874- Enrolled in engineering course at Ecole des Pontes at Clausses. He was rewarded a degree 3 years later
1876- Becquerel appointed a junior teacher at his alma mater
1877-Graduated from EDP. Department of Bridges and Highways of the French Government appointed Henri as an engineer
1889-memeber of the academic des Sciences
1892- Became the physics chair of the museum
1896- Henri discovers radioactivity and the three classes

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In 1896, he found that the radiation he discovered could not be x-rays. x-rays are neutral and cannot be bent in a magnetic field. This showed that particles could be emitted from within the atom. Therefore the atom was not invisible Henri also found there were 3 classes of radioactivity: negative, positive, and neutral.

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Henri was studying the properties of x-rays. He exposes potassium uranyl sulfate to sunlight and then placed it on photographic plates wrapped in black paper, beleiving that the uranium asorbed the suns' energy then emitted as x-rays