Why Big Fr and Hungry F?

1) Why Francium is the biggest element with the lowest IE and EN?
Francium is the biggest element with the lowest IE and EN because it is easy for the atom to lose e-. Francium has a total of 7 shells, the most number of shells, and has the least powerful nucleus. It has the largest atomic radius since it has fewer protons there is less of an attraction. Also it has the least powerful charge, and it woud make it easy to lose an electron.

2)Why Helium is the smallest element with the highest IE?
Helium is the smallest element with the highest IE because when an atom has high IE it is hard for an atom to lose e-. It is a noble gas and it doesn't react, so it is impossible for it to lose or gain e-.

3)Why Noble Gases don't have EN values?
Noble Gases don't have EN values because they have a full valence shell so they don't react.

4)Why Fluorine has the highest EN?
The reason that Flourine has the highest EN is that it is a halogen which means it has 7 valence electrons and it needs only one more to complete its valence shell. It is the smallest, has the fewest shells, which means that Fluorine has a greater tendency to attract other electrons. Fluorine is the most reactive element out of all the halogens because of its small size and its high EN level which makes it want to grab other electrons.

Uranium is Element #92

The Element I chose to do is Uranium.

Uranium in 3 different languages is Uranio , Uraan, and Uran.

As a pure element, Uranium looks silvery, metallic and like a rock in its natural form.

Its crystal structure is Orthorhombic.

Isotope	Atomic mass (ma/u)	Natural abundance (atom %)	Nuclear spin (I)	Magnetic moment (μ/μN)
234U	234.0409468 (24)	[0.0055 (2)]	0	0
235U	235.0439242 (24)	[0.7200 (51)]	7/2	-0.35
238U	238.0507847 (23)	[99.2745 (106)]	0	0

The number of protons in a Uranium atom is 92 .
Number of Neutrons in a Uranium atom is 146 .

The average atomic mass of Uranium is 238.0289 amu.

The number of Uranium electrons per shell - 2,8,18,32,21,9,2

There are 92 electrons in the neutral form of the element.

The bond length in UU is: 277 pm

Atomic Radius (empirical): 175 pm

Temperatures

• Melting point: 1405.3 [or 1132.2 °C (2070 °F)] K
• Boiling point: 4200 [or 3927 °C (7101 °F)] K
• Liquid range: 2794.7 K
• Critical temperature: no data K
• Superconduction temperature: 0.2 [or -272.9 °C (-459.2 °F)] K

Expansion and conduction properties

• Thermal conductivity: 27 W m^-1 K^-1
• Coefficient of linear thermal expansion: 13.9 x 10^-6 K^-1

Bulk properties

• Density of solid: 19050 kg m^-3
• Molar volume: 12.49 cm³
• Velocity of sound: 3155 m s^-1
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I have 0.00008999999999999999 g of uranium inside of me, which is approximately 1 ppb by weight.

Abundance in the Earths Crust:

2.7 parts per million by weight, 0.25 parts per million by moles. I was not able to find the amount of Uranium in the Universe, because it is being studied to date the Universe, because it was probably first created when a star blew up.

URANIUM creates Fluorides, Chlorides, Bromides, Iodides, Oxides, Sulfides, Selenides, Tellurides, Nitrides.

Some examples would be:

• Uranium trifluoride: UF₃
• Tetrauranium heptadecafluoride: U₄F₁₇

• Uranium trichloride: UCl₃
• Uranium hexachloride: UCl₆

• Uranium tetrabromide: UBr₄
• Uranium pentabromide: UBr₅

• Uranium triiodide: UI₃
• Uranium tetraiodide: UI₄

• Uranium oxide: UO
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• This Uranium Oxide was used to create the bomb in the Manhattan project.
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• Uranium dioxide: UO₂
• Uranium trioxide: UO₃

• Uranium sulphide: US
• Diuranium trisulphide: U₂S₃

• Uranium diselenide: USe₂
• Uranium triselenide: USe₃
• _{Uranium ditelluride: UTe2}

• Uranium tritelluride: UTe₃

• Uranium nitride: UN

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• Diuranium trinitride: U₂N₃
• Diuranium trinitride: U₃N₂

The German chemist Martin Heinrich Klaproth discovered the element in 1789 when he recognized an unknown element in the mineral pitchblende.

Uranium is of a lot of interest because of its uses to form nuclear power and nuclear weapons. Uranium contamination is a big environmental problem. It is not extremely rare and is more common than beryllium or tungsten.

I chose to do this element, because i really like watching the TV show, 24. In the TV show, the main character, Jack Bauer, has to save New York from being attacked by a nuclear bomb, made with Uranium-235 rods.

Resources:

www.webelements.com/uranium

http://www.eoearth.org/article/uranium

http://www.chemicalelements.com/elements/u.html

http://www.rsc.org/chemistryworld/News/2005/September/16090502.asp

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