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 ?• 50Cr

• 52Cr

• 53Cr

• 54Cr

• 3d54s1

4.345%

83.789%

9.501%

2.365%

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:• 249.8pm

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 H2

Works Cited

• http://www.webelements.com/chromium/

• http://wwwchem.uwimona.edu.jm/courses/chromium.html