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Chromium

Chromium. By: Ariana James Chemistry. Who discovered Chromium? When was it discovered?. Louis-Nicholas Vauquelin discovered Chromium during 1797 in France. Atomic Symbol? Name? Number?. Symbol: Cr Name: Chromium Number: 24. Atomic Mass? Protons, Electrons and Neutrons?.

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Chromium

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  1. Chromium By: Ariana James Chemistry

  2. Who discovered Chromium? When was it discovered? • Louis-Nicholas Vauquelin discovered Chromium during 1797 in France.

  3. Atomic Symbol? Name? Number? Symbol: Cr Name: Chromium Number: 24

  4. Atomic Mass? Protons, Electrons and Neutrons? • Mass: 51.9961 g/mol. • 24 protons • 24 electrons • 28 neutrons

  5. Is It a Metal, Metalloid, or non metal? Solid, Liquid, or Gas? • Chromium is a solid, metal.

  6. What group is it in? Why? What period? • Chromium is in group 6. Chromium is a transition element; it’s cations have an incomplete d-subshell. It is located in period 4.

  7. What types of isotopes are in Chromium? Electron Configuration ? • 50Cr • 52Cr • 53Cr • 54Cr • 3d54s1 4.345% 83.789% 9.501% 2.365%

  8. Definition of Ionization energy and units: • Ionization Energy: • The measure of the energy required to remove one electron from one molecule in the gaseous state. • Units: • 652.9 KJ/mol.-1

  9. What ion is your element most likely to form? Can it form more than one ion? If so, what are the other ions? • Chromium ions is a transitional metal and it forms octahedral complexes. Atomic Radius: • 249.8pm

  10. Define electronegativity. What is the electronegativity of your element? • The tendency of an atom or radical to attract electrons in the formation of an ionic bond. • Electronegativity of Chromium: 1.66

  11. Interesting Facts • Origin name “chroma” meaning colour • Chromium is used to give glass an emerald green color. Chromium is also responsible for the color red in rubies. • Chromium metal dissolves in dilute hydrolic acid to form solutions containing the aquated Cr(II) ion together with hydrogen gas H2

  12. Works Cited • http://www.webelements.com/chromium/ • http://wwwchem.uwimona.edu.jm/courses/chromium.html

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