WarmUp. Complete the worksheet you received two classes ago regarding subatomic particles & symbols of atoms. If you have already completed that, work on filling out the front side of the “Atomic Structure Vocabulary & Skills” page you got today. Practice.
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Complete the worksheet you received two classes ago regarding subatomic particles & symbols of atoms.
If you have already completed that, work on filling out the front side of the “Atomic Structure Vocabulary & Skills” page you got today.
7Li +1
40Ca +2
14N 3
112Cd +2
1H +1
1H 1
3 p+, 4 n0, 2 e
20 p+, 20 n0, 18 e
7 p+, 7 n0, 10 e
48 p+, 64 n0, 46 e
1 p+, 0 n0, 0 e
1 p+, 0 n0, 2 e
1
+1
nucleus
1
0
nucleus
outside nucleus
negligible (0)
1
17
Cl
35.453
Mass number
Cl
vs.
35
17
Atomic number
symbol
Atomic number
symbol
(Average) Atomic Mass
Where does the “35.453” come from?
Cl
Cl
vs.
35
17
37
17
18 neutrons
20 neutrons
Where does the “35.453” come from?
Weighted average formula: S(% x mass)
Example:
(T) 0.50 x92 =46.00
(Q) 0.25 x 100 =25.00
(H) 0.25 x 65 = +16.25
87.25
How can we apply weighted averages to atomic mass?
Where does the “35.453” come from?
vs.


0
+
+
0
+
0

ATOM
ATOM




0
0
+
+
+
+
0
0
+
+

0
+
+
+
0
+



ISOTOPE
ION
(0.989 x 12.0 amu) = 11.868
(0.011 x 13.00335 amu) = + 0.01430
12.011 amu