Atoms, Molecules, And Ions Worksheet - Chapter 2 Page 9
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27Atomic Masses of the Elements
•
Isotopic mass
is the mass in amu (u), of a particular
isotope of an element.
• Different isotopes of an element all react essentially
the same, so a weighted average of isotopic masses
can be used in calculations.
• The
atomic weight
is the weighted average mass, of
the naturally occurring element. It is calculated from
the isotopes of an element weighted by their relative
abundances.
. . .
Atomic weight = fraction
m
+ fraction
m
+
A
A
B
B
Σ
Atomic weight =
[(isotope mass)×(fractional isotope abundance)]
Average Atomic Mass = Atomic Weight
Periodicity
When one looks at the chemical properties of elements,
one notices a repeating pattern of reactivities.
9
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