Chromium By Ariana James Chemistry Who discovered 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? • Mass: 51. 9961 g/mol. • 24 protons • 24 electrons • 28 neutrons

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

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.

What types of isotopes are in Chromium? Electron Configuration ? • 50 Cr 4. 345% • 52 Cr 83. 789% • 53 Cr 9. 501% • 54 Cr 2. 365% • 3 d 54 s 1

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

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. 8 pm

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

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 H 2

Works Cited • http: //www. webelements. com/chromi um/ • http: //wwwchem. uwimona. edu. jm/co urses/chromium. html