Group 1 Group 18
1 1
1.00794 1
2
H
1s1 Hydrogen Group 2
Atomic Number
Key
30
65.39 2
Atomic Mass
4.002602 0
He
Group 13 Group 14 Group 15 Group 16 Group 17 1s2 Helium
3 2
(6.941) 1
4
9.012182 2
Li
[He]2s1 Lithium
Be
[He]2s2 Beryllium
Zn
[Ar]3d104s2 Zinc
Oxidation States Symbol Electron Configuration
5
10.811 3
6
12.0107 ±4,2
7
14.0067 ±3,5,4,2
8
15.9994 -2
9 18.9984032
-1
10
20.1797
B
[He]2s22p1 Boron
C
[He]2s22p2 Carbon
N
[He]2s22p3 Nitrogen
O
[He]2s22p4 Oxygen
F
[He]2s22p5 Fluorine
Ne
[He]2s22p6 Neon
11 22.98977
1
12
24.305 2
Name
13 26.981538
3
14
28.0855 4,2
15 30.973761
±3,5,4
16
32.065 ±2,4,6
17
35.453 ±1,3,5,7
18
39.948
3
Na
[Ne]3s1 Sodium
Mg
[Ne]3s2 Magnesium Group 3 Group 4 Group 5 Group 6 Group 7 Group 8 Group 9 Group 10 Group 11 Group 12
Al
[Ne]3s23p1 Aluminum
Si
[Ne]3s23p2 Silicon
P
[Ne]3s23p3 Phosphorus
S
[Ne]3s23p4 Sulfur
Cl
[Ne]3s23p5 Chlorine
Ar
[Ne]3s23p6 Argon
Period
19 4
39.0983 1
20
40.078 2
21 44.95591
3
22
47.867 4,3
23
50.9415 5,4,3,2
24
51.9961 6,3,2
25 54.938049
7,6,4,2,3
26
55.845 2,3
27
58.9332 2,3
28
58.6934 2,3
29
63.546 2,1
30
65.409 2
31
69.723 3
32
72.64 4
33
74.9216 ±3,5
34
78.96 -2,4,6
35
79.904 ±1,5,7
36
83.798 0,2
K
[Ar]4s1 Potassium
Ca
[Ar]4s2 Calcium
Sc
[Ar]3d14s2 Scandium
Ti
[Ar]3d24s2 Titanium
V
[Ar]3d34s2 Vanadium
Cr
[Ar]3d54s1 Chromium
Mn
[Ar]3d54s2 Manganese
Fe
[Ar]3d64s2 Iron
Co
[Ar]3d74s2 Cobalt
Ni
[Ar]3d84s2 Nickel
Cu
[Ar]3d104s1
Copper
Zn
48
112.411 2
Ga
49
114.818 3
Ge
50
118.71 4,2
As
51
121.76 ±3,5
Se
52
127.6 -2,4,6
Br
53 126.90447
±1,5,7
Kr
54
131.293 0,2,4,6
[Ar]3d104s2 [Ar]3d104s24p1 [Ar]3d104s24p2