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Transcript
Masses of Atoms
Pages 550 - 553
Element ~ matter that is unique from all others, because of
different numbers of protons.
Element ~ matter that is unique from all others, because of
different numbers of protons.
Symbol ~ unique letter to represent element
Element ~ matter that is unique from all others, because of
different numbers of protons.
Symbol ~ unique letter to represent element
Atomic Number ~ number of protons in the atom of an
element
Element ~ smallest particle that is unique from all others
Symbol ~ unique letter to represent element
Atomic Number ~ number of protons in the atom of an
element
Carbon - 12 (6 protons, 6 neutrons)
Carbon - 14 (6 protons, 8 neutrons)
Element ~ matter that is unique from all others, because of
different numbers of protons.
Symbol ~ unique letter to represent element
Atomic Number ~ number of protons in the atom of an
element
Atomic Mass ~ number of neutrons AND number of protons
Isotope ~ atoms of the same element, with different
numbers of neutrons
Element ~ smallest particle that is unique from all others
Symbol ~ unique letter to represent element
Atomic Number ~ number of protons in the atom of an
element
Atomic Mass ~ number of neutrons AND number of protons
Isotope ~ atoms of the same element, with different
numbers of neutrons
Carbon - 12 (6 protons, 6 neutrons)
Carbon - 14 (6 protons, 8 neutrons)
SAME ELEMENT, DIFFERENT NEUTRON NUMBERS
Element ~ matter that is unique from all others, because of
different numbers of protons.
Symbol ~ unique letter to represent element
Atomic Number ~ number of protons in the atom of an
element
Atomic Mass ~ number of neutrons AND number of protons
Isotope ~ atoms of the same element, with different
numbers of neutrons
Atomic Mass Unit ~ 1/12th of the mass of one carbon-12
atom
Element ~ matter that is unique from all others, because of
different numbers of protons.
Symbol ~ unique letter to represent element
Atomic Number ~ number of protons in the atom of an
element
Atomic Mass ~ number of neutrons AND number of protons
Isotope ~ atoms of the same element, with different
numbers of neutrons
Atomic Mass Unit ~ 1/12th of the mass of one carbon-12
atom
The periodic table shows the atomic mass of Nickel as
58.693. How can there be a decimal point, if the mass is
whole numbers of protons and neutrons?
Element ~ smallest particle that is unique from all others
Symbol ~ unique letter to represent element
Atomic Number ~ number of protons in the atom of an
element
Atomic Mass ~ number of neutrons AND number of protons
Isotope ~ atoms of the same element, with different
numbers of neutrons
Atomic Mass Unit ~ 1/12th of the mass of one carbon-12
atom
The periodic table shows the atomic mass of Nickel as
58.693. How can there be a decimal point, if the mass is
whole numbers of protons and neutrons?
Example, with boron.
Facts: Boron has an accepted amu of 10.811
80% of Boron in nature have 5 protons, 6 neutrons ~ 11 amu
20% of Boron in nature have 5 protons, 5 neutrons ~ 10 amu
(.8 • 11 amu) + (.2 • 10 amu) = 8.8 amu + 2 amu = 10.8 amu
There are a few extra isotopes out there that we did not include.
Nickel, in nature, has 8 (pretty) stable isotopes. Each has (of
course) 28 protons.
Percent
Number
Atomic
in
of
mass Isotope
protons
neutrons
Number
of
nature
units
Ni-58
69%
28
30
58
Ni-60
27%
28
32
60
Ni-62
4%
28
34
62
What, given this information, is the approximate atomic mass
of Nickel?
Nickel, in nature, has 8 (pretty) stable isotopes. Each has (of
course) 28 protons.
Percent
Number
Atomic
in
of
mass Isotope
protons
neutrons
Number
of
nature
units
Ni-58
69%
28
30
58
Ni-60
27%
28
32
60
Ni-62
4%
28
34
62
(.69 • 58) + (.27 • 60) + (.04 • 62) = 58.7 amu