6/21/14
1) a. 6
electrons
b. 13 protons
c.
82 electrons
d.
17 protons
2) a. no
b.
no
c.
yes
d.
no
3)
|
Element symbol
|
Number of Protons
|
Number of Neutrons
|
Number of Electrons
|
|
C
|
6
|
6
|
6
|
|
C
|
6
|
7
|
6
|
|
Ca
|
20
|
21
|
20
|
|
Pt
|
78
|
117
|
78
|
|
U
|
92
|
146
|
92
|
4) The lead atom
must lose two protons to make the ion not gain.
5) a. Mass
number for C: 12
C:
13
Ca:
41
Pt:
195
U:
238
b.
Carbon
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