• The number of protons found in the nucleus of an atom

• Protons and electrons are usually the same number unless they are isotopes.

• It determines what the element is.

• The element Uranium has a atomic number of 92.

• The average mass of a chemical element expressed in mass units

• Calculated by adding the number of protons and neutrons in the nucleus of an atom.

• The atomic mass of Uranium is, (92(e)+146(n)), 238 amu.

• The temperature at which a liquid boils at sea level.

• Expressed in Kelvin instead of Celsius

• Conversion of Celsius to Kelvin: ºC + 273

• The boiling point of Uranium is, (3818°C + 273), 4091 K.

• The temperature at which a solid becomes a liquid at 1 atm.

• Expressed in Kelvin instead of Celsius

• Conversion of Celsius to Kelvin: ºC + 273

• The melting point of Uranium is, ( 1132°C + 273), 1405 K.

• Defined as the measure of the amount of matter

• The symbol for density is (ρ), the Greek letter rho.

• The density of Uranium is 18.95 g/cm3.

• There are 3 types of matter:

1. Solid

2. Liquid

3. Gas

• Everything in the world either exists as a solid, liquid, or gas.

• Uranium is in the physical state of a solid.

• The electrons on the outermost shell of an atom

• Determines how the atom reacts with other atoms

• Uranium has 6 valence electrons on its outermost shell.

• The arrangement of electrons in an atom

• The format when writing an atom’s electron configuration consists of numbers, letters, and subscripts.

• For example: 1s2

1: orbital #

s: type of orbital

2: # of electrons in that orbital

• The electron configuration of Uranium is portrayed as: 1s2 2s2p6 3s2p6d10 4s2p6d10f14 5s2p6d10f3 6s2p6d1 7s2

• There are 18 vertical groups on a periodic table.

• There also 7 horizontal periods on the periodic table of elements.

• Group of Uranium: 3

• Period of Uranium: 7

• an atom with the same atomic # but has a different # of neutrons

• Uranium has a total of 21 isotopes.

• The 3 main isotopes of U are:

U-234, U-235, and U- 238.

• Founded by Martin Klaproth

• 1789 in Germany

• Uranium got its name from the planet Uranus

• It is ranked as the 48th element to be most abundant in the world