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| Element |
 |
|
| Symbol |
 |
|
| Atomic Number |
 |
|
| Approximate Atomic Weight |
 |
|
| Usual Valence |
 |
|
| Aluminum |
Al |
13 |
27 |
+3 |
| Antimony |
Sb |
51 |
122 |
+3, +5 |
| Argon |
Ar |
18 |
40 |
0 |
| Arsenic |
As |
33 |
75 |
+-3, +5 |
| Barium |
Ba |
56 |
137 |
+2 |
| Bismuth |
Bi |
83 |
209 |
+3, +5 |
| Boron |
B |
5 |
11 |
+3 |
| Bromine |
Br |
35 |
80 |
-1 |
| Cadmium |
Cd |
48 |
112 |
+2 |
| Calcium |
Ca |
20 |
40 |
+2 |
| Carbon |
C |
6 |
12 |
+-4 |
| Chlorine |
Cl |
17 |
35.5 |
-1 |
| Chromium |
Cr |
24 |
52 |
+3, +6 |
| Cobalt |
Co |
27 |
59 |
+2 |
| Copper |
Cu |
29 |
63.5 |
+1, +2 |
| Flourine |
F |
9 |
19 |
-1 |
| Gold |
Au |
79 |
197 |
+1, +3 |
| Helium |
He |
2 |
4 |
0 |
| Hydrogen |
H |
1 |
1 |
+1 |
| Iodine |
I |
53 |
127 |
-1 |
| Iron |
Fe |
26 |
56 |
+2, +3 |
| Lead |
Pb |
82 |
207 |
+2, +4 |
|