1
IA
1A
18
VIIIA
8A
2
IIA
2A
13
IIIA
3A
14
IVA
4A
15
VA
5A
16
VIA
6A
17
VIIA
7A
3
IIIB
3B
4
IVB
4B
5
VB
5B
6
VIB
6B
7
VIIB
7B
8 9
VIII
8
10 11
IB
1B
12
IIB
2B
Periodic Table of the Elements
Lanthanide
Series
Actinide
Series
© 2014 Todd Helmenstine
sciencenotes.org
1
HHydrogen
1.008
3
LiLithium
6.941
4
BeBeryllium
9.012
11
NaSodium
22.990
12
MgMagnesium
24.305
19
KPotassium
39.098
20
CaCalcium
40.078
21
ScScandium
44.956
22
TiTitanium
47.88
23
VVanadium
50.942
24
CrChromium
51.996
25
MnManganese
54.938
26
FeIron
55.933
27
CoCobalt
58.933
28
NiNickel
58.693
29
CuCopper
63.546
30
ZnZinc
65.39
31
GaGallium
69.732
13
AlAluminum
26.982
5
BBoron
10.811
32
GeGermanium
72.61
14
SiSilicon
28.086
6
CCarbon
12.011
33
AsArsenic
74.922
15
PPhosphorus
30.974
7
NNitrogen
14.007
34
SeSelenium
78.972
16
SSulfur
32.066
8
OOxygen
15.999
35
BrBromine
79.904
17
ClChlorine
35.453
9
FFluorine
18.998
36
KrKrypton
84.80
18
ArArgon
39.948
10
NeNeon
20.180
2
HeHelium
4.003
37
RbRubidium
84.468
38
SrStrontium
87.62
39
YYttrium
88.906
40
ZrZirconium
91.224
41
NbNiobium
92.906
42
MoMolybdenum
95.95
43
TcTechnetium
98.907
44
RuRuthenium
101.07
45
RhRhodium
102.906
46
PdPalladium
106.42
47
AgSilver
107.868
48
CdCadmium
112.411
49
InIndium
114.818
50
SnTin
118.71
51
SbAntimony
121.760
52
TeTellurium
127.6
53
IIodine
126.904
54
XeXenon
131.29
55
CsCesium
132.905
56
BaBarium
137.327
57-71 72
HfHafnium
178.49
73
TaTantalum
180.948
74
WTungsten
183.85
75
ReRhenium
186.207
76
OsOsmium
190.23
77
IrIridium
192.22
78
PtPlatinum
195.08
79
AuGold
196.967
80
HgMercury
200.59
81
TlThallium
204.383
82
PbLead
207.2
83
BiBismuth
208.980
84
PoPolonium
[208.982]
85
AtAstatine
209.987
86
RnRadon
222.018
87
FrFrancium
223.020
88
RaRadium
226.025
89-103
57
LaLanthanum
138.906
58
CeCerium
140.115
59
PrPraseodymium
140.908
60
NdNeodymium
144.24
61
PmPromethium
144.913
62
SmSamarium
150.36
63
EuEuropium
151.966
64
GdGadolinium
157.25
65
TbTerbium
158.925
66
DyDysprosium
162.50
67
HoHolmium
164.930
68
ErErbium
167.26
69
TmThulium
168.934
70
YbYtterbium
173.04
71
LuLutetium
174.967
89
AcActinium
227.028
Alkali
Metal
Alkaline
Earth
Transition
Metal
Basic
Metal
Semimetal Nonmetal Halogen
Noble
Gas
Lanthanide Actinide
90
ThThorium
232.038
91
PaProtactinium
231.036
92
UUranium
238.029
93
NpNeptunium
237.048
94
PuPlutonium
244.064
95
AmAmericium
243.061
96
CmCurium
247.070
97
BkBerkelium
247.070
98
CfCalifornium
251.080
99
EsEinsteinium
[254]
100
FmFermium
257.095
101
MdMendelevium
258.1
102
NoNobelium
259.101
103
LrLawrencium
[262]
104
RfRutherfordium
[261]
105
DbDubnium
[262]
106
SgSeaborgium
[266]
107
BhBohrium
[264]
108
HsHassium
[269]
109
MtMeitnerium
[268]
110
DsDarmstadtium
[269]
111
RgRoentgenium
[272]
112
CnCopernicium
[277]
113
UutUnuntrium
unknown
114
FlFlerovium
[289]
115
UupUnunpentium
unknown
116
LvLivermorium
[298]
117
UusUnunseptium
unknown
118
UuoUnunoctium
unknown
Atomic
Number
Symbol
Atomic
Mass
Name
Electron Configuration
1s1
[Rn]5f146d107s27p2* [Rn]5f146d107s27p3* [Rn]5f146d107s27p4* [Rn]5f146d107s27p5* [Rn]5f146d107s27p6*[Rn]5f146d107s27p1*[Rn]5f146d107s2*
Configurations denoted with a * are unknown and the listed values are predicted.
[Rn]5f146d97s2*[Rn]5f146d87s2*[Rn]5f146d77s2*[Rn]5f146d67s2*[Rn]5f146d57s2*[Rn]5f146d47s2*[Rn]5f146d37s2*
[Xe]4f145d66s2 [Xe]4f145d76s2 [Xe]4f145d96s1 [Xe]4f145d106s1 [Xe]4f145d106s2 [Xe]4f145d106s26p1 [Xe]4f145d106s26p2 [Xe]4f145d106s26p3 [Xe]4f145d106s26p4 [Xe]4f145d106s26p5 [Xe]4f145d106s26p6
[Kr]4d105s25p1[Kr]4d105s2[Kr]4d10[Kr]4d85s1[Kr]4d75s1[Kr]4d55s2[Kr]4d55s1[Kr]4d45s1[Kr]4d25s2[Kr]4d15s2 [Kr]4d105s1 [Kr]4d105s25p2 [Kr]4d105s25p3 [Kr]4d105s25p4 [Kr]4d105s25p5 [Kr]4d105s25p6
[Ar]3d104s24p1[Ar]3d104s2[Ar]3d84s2[Ar]3d74s2[Ar]3d64s2[Ar]3d54s2[Ar]3d54s1[Ar]3d34s2[Ar]3d24s2[Ar]3d14s2 [Ar]3d104s1 [Ar]3d104s24p2 [Ar]3d104s24p3 [Ar]3d104s24p4 [Ar]3d104s24p5 [Ar]3d104s24p6
[Ne]3s23p1 [Ne]3s23p2 [Ne]3s23p3 [Ne]3s23p4 [Ne]3s23p5 [Ne]3s23p6
[Ar]4s1
[Ne]3s1
[He]2s22p1 [He]2s22p2 [He]2s22p3 [He]2s22p4 [He]2s22p5 [He]2s22p6[He]2s1
[Ar]4s2
[Ne]3s2
[He]2s2
1s2
[Xe]4f145d56s2[Xe]4f145d46s2[Xe]4f145d36s2
[Rn]5f146d27s2*
[Xe]4f145d26s2
[Rn]5f146d17s2
[Xe]4f145d16s2
[Rn]5f76d17s2[Rn]5f46d17s2[Rn]5f36d17s2[Rn]5f26d17s2[Rn]6d27s2[Rn]6d17s2
[Rn]7s2[Rn]7s1
[Xe]6s2[Xe]6s1
[Kr]5s2[Kr]5s1
[Rn]5f147s2[Rn]5f137s2[Rn]5f127s2[Rn]5f117s2[Rn]5f107s2[Rn]5f97s2[Rn]5f67s2 [Rn]5f77s2
[Xe]4f75d16s2[Xe]4f56s2[Xe]4f46s2[Xe]4f36s2[Xe]4f15d16s2[Xe]5d16s2 [Xe]4f96s2 [Xe]4f106s2 [Xe]4f116s2 [Xe]4f126s2 [Xe]4f136s2 [Xe]4f146s2[Xe]4f66s2 [Xe]4f76s2