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Periodic Table

Quick Reference for atomic structure.

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1A 2A 3A 4A 5A 6A 7A 8A
1 1
H
2
He
2 3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3 11
Na
12
Mg
3B 4B 5B 6B 7B
8B
1B 2B 13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4 19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5 37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6 55
Cs
56
Ba
L* 72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7 87
Fr
88
Ra
A*
*Lanthanide 57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
*Actinide 89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr

Selecting a Symbol within the table will take you to the appropriate region of the list.
Listed in Alphabetical order.


Name Symbol Z Mass [Core] Valence
_______________ _______ _______ ______________ ________________________
Actinium Ac 89 [227] [Rn] 6d 7s2
Aluminum Al 13 26.981539 [Ne] 3s2 3p
Americium Am 95 243 [Rn] 5f7 7s2
Antimony Sb 51 121.757 [Kr] 4d10 5s2 5p3
Argon Ar 18 39.948 [Ne] 3s2 3p6
Arsenic As 33 74.92159 [Ar] 3d10 4s2 4p3
Astatine At 85 [210] [Xe] 4f14 5d10 6s2 6p5
Barium Ba 56 137.327 [Xe] 6s2
Berkelium Bk 97 [247] [Rn] 5f9 7s2
Berylium Be 4 9.012182 1s2 2s2
Bismuth Bi 83 208.98037 [Xe] 4f14 5d10 6s2 6p3
Boron B 5 10.811 1s2 2s2 2p
Bromine Br 35 79.904 [Ar] 3d10 4s2 4p5
Cadmium Cd 48 112.411 [Kr] 4d10 5s2
Calcium Ca 20 40.078 [Ar] 4s2
Californium Cf 98 [251] [Rn] 5f10 7s2
Carbon C 6 12.011 1s2 2s2 2p2
Cerium Ce 58 140.115 [Xe] 4f 5d 6s2
Cesium Cs 55 132.90543 [Xe] 6s
Chlorine Cl 17 35.4527 [Ne] 3s2 3p5
Chromium Cr 24 51.9961 [Ar] 3d5 4s
Cobalt Co 27 58.93320 [Ar] 3d7 4s2
Copper Cu 29 63.546 [Ar] 3d10 4s
Curium Cm 96 [247] [Rn] 5f7 6d 7s2
Dysprosium Dy 66 162.5 [Xe] 4f10 6s2
Einsteinium Es 99 [252] [Rn] 5f11 7s2
Erbium Er 68 167.26 [Xe] 4f12 6s2
Europium Eu 63 151.965 [Xe] 4f7 6s2
Fermium Fm 100 [257] [Rn] 5f12 7s2
Fluorine F 9 18.9984032 1s2 2s2 2p5
Francium Fr 87 [223] [Rn] 7s
Gadolinium Gd 64 157.25 [Xe] 4f7 5d 6s2
Gallium Ga 31 69.723 [Ar] 3d10 4s2 4p
Germanium Ge 32 72.61 [Ar] 3d10 4s2 4p2
Gold Au 79 196.96654 [Xe] 4f14 5d10 6s
Hafnium Hf 72 178.49 [Xe] 4f14 5d2 6s2
Helium He 2 4.002602 1s2
Holmium Ho 67 164.93032 [Xe] 4f11 6s2
Hydrogen H 1 1.00794 1s
Indium In 49 114.82 [Kr] 4d10 5s2 5p
Iodine I 53 126.90447 [Kr] 4d10 5s2 5p5
Iridium Ir 77 192.22 [Xe] 4f14 5d7 6s2
Iron Fe 26 55.847 [Ar] 3d6 4s2
Krypton Kr 36 83.80 [Ar] 3d10 4s2 4p6
Lanthanum La 57 138.9055 [Xe] 5d 6s2
Lawrencium Lr 103 [262] [Rn] 5f14 7s2 7p
Lead Pb 82 207.2 [Xe] 4f14 5d10 6s2 6p2
Lithium Li 3 6.941 1s2 2s
Lutetium Lu 71 174.967 [Xe] 4f14 5d 6s2
Magnesium Mg 12 24.3050 [Ne] 3s2
Manganese Mn 25 54.93805 [Ar] 3d5 4s2
Mendelevium Md 101 [258] [Rn] 5f13 7s2
Mercury Hg 80 200.59 [Xe] 4f14 5d10 6s2
Molybdenum Mo 42 95.94 [Kr] 4d5 5s
Neodymium Nd 60 144.24 [Xe] 4f4 6s2
Neon Ne 10 20.1797 1s2 2s2 2p6
Neptunium Np 93 [237]3902 [Rn] 5f4 6d 7s2
Nickel Ni 28 58.6934 [Ar] 3d8 4s2
Niobium Nb 41 92.90638 [Kr] 4d4 5s
Nitrogen N 7 14.00674 1s2 2s2 2p3
Nobelium No 102 [259] [Rn] 5f14 7s2
Osmium Os 76 190.2 [Xe] 4f14 5d6 6s2
Oxygen O 8 15.9994 1s2 2s2 2p4
Palladium Pd 46 106.42 [Kr] 4d10
Phosphorous P 15 30.973762 [Ne] 3s2 3p3
Platinum Pt 78 195.08 [Xe] 4f14 5d9 6s
Plutonium Pu 94 [244] [Rn] 5f6 7s2
Polonium Po 84 [209] [Xe] 4f14 5d10 6s2 6p4
Potassium K 19 39.0983 [Ar] 4s
Praseodymium Pr 59 140.90765 [Xe] 4f3 6s2
Promethium Pm 61 [145] [Xe] 4f5 6s2
Protactinium Pa 91 231.03588 [Rn] 5f2 6d 7s2
Radium Ra 88 [226] [Rn] 7s2
Radon Rn 86 [222] [Xe] 4f14 5d10 6s2 6p6
Rhenium Re 75 186.207 [Xe] 5f14 5d5 6s2
Rhodium Rh 45 102.90550 [Kr] 4d8 5s
Rubidium Rb 37 85.4678 [Kr] 5s
Ruthenium Ru 44 101.07 [Kr] 4d7 5s
Samarium Sm 62 150.36 [Xe] 4f6 6s2
Scandium Sc 21 44.955910 [Ar] 3d 4s2
Selenium Se 34 78.96 [Ar] 3d10 4s2 4p4
Silicon Si 14 28.0855 [Ne] 3s2 3p2
Silver Ag 47 107.8682 [Kr] 4d10 5s
Sodium Na 11 22.989768 [Ne] 3s
Strontium Sr 38 87.62 [Kr] 5s2
Sulfur S 16 32.066 [Ne] 3s2 3p4
Tantalum Ta 73 180.9479 [Xe] 4f14 5d3 6s2
Technetium Tc 43 [98] [Kr] 4d6 5s
Tellurium Te 51 127.60 [Kr] 4d10 5s2 5p4
Terbium Tb 65 158.92534 [Xe] 4f9 6s2
Thallium Tl 81 204.3833 [Xe] 4f14 5d10 6s2 6p
Thorium Th 90 232.0381 [Rn] 6d2 7s2
Thulium Tm 69 168.93421 [Xe] 4f13 6s2
Tin Sn 50 118.710 [Kr] 4d10 5s2 5p2
Titanium Ti 22 47.88 [Ar] 3d2 4s2
Tungsten W 74 183.85 [Xe] 4f14 5d4 6s2
Uranium U 92 238.0289 [Rn] 5f3 6d 7s2
Vanadium V 23 50.9415 [Ar] 3d3 4s2
Xenon Xe 54 131.29 [Kr] 4d10 5s2 5p6
Ytterbium Yb 70 173.04 [Xe] 4f14 6s2
Yttrium Y 39 88.90585 [Kr] 4d 5s2
Zinc Zn 30 65.39 [Ar] 3d10 4s2
Zirconium Zr 40 91.224 [Kr] 4d2 5s2

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Created: November 11, 1998 --- Last Updated: November 13, 1998
By Mark D. Pauli