Transcript 36527.1275369591.71-60-84

• 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.
•
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.
2
• For example: 1s
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
Isotopes
• 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 U238.
• 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