Key:
123456789a1234
atomic number
Symbol
name
atomic weight
shells
valence
123456789a1234
123456789a1234
s
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p
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d
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f
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1 1s-1
H
Hydrogen
1.008
1
1s1
123456789a1234
2 1s-1
He
Helium
4.0026
2
1s2
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3 2s-2
Li
Lithium
6.94
2 1
2s1
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4 2s-2
Be
Berylium
9.0122(1)
2 2
2s2
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5 2p-3
B
Boron
10.81
2 3
2s22p1
123456789a1234
6 2p-3
C
Carbon
12.011
2 4
2s22p2
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7 2p-3
N
Nitrogen
14.007
2 5
2s22p3
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8 2p-3
O
Oxygen
15.999
2 6
2s22p4
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9 2p-3
F
Fluorine
18.998(1)
2 7
2s22p5
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10 2p-3
Ne
Neon
20.180
2 8
2s22p6
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11 3s-3
Na
Sodium
22.990(1)
2 8 1
3s1
123456789a1234
12 3s-3
Mg
Magnesium
24.305
2 8 2
3s2
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13 3p-4
Al
Aluminum
26.982(1)
2 8 3
3s23p1
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14 3p-4
Si
Silicon
28.085
2 8 4
3s23p2
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15 3p-4
P
Phosphorus
30.974(1)
2 8 5
3s23p3
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16 3p-4
S
Sulfur
32.06
2 8 6
3s23p4
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17 3p-4
Cl
Chlorine
35.45
2 8 7
3s23p5
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18 3p-4
Ar
Argon
39.948
2 8 8
3s23p6
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19 4s-4
K
Potassium
39.098
2 8 8 1
4s1
123456789a1234
20 4s-4
Ca
Calcium
40.078
2 8 8 2
4s2
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21 3d-5
Sc
Scandium
44.956(1)
2 8 9 2
3d14s2
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22 3d-5
Ti
Titanium
47.867
2 8 10 2
3d24s2
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23 3d-5
V
Vanadium
50.942
2 8 11 2
3d34s2
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24 3d-5
Cr
Chromium
51.996
2 8 13 1
3d54s1
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25 3d-5
Mn
Manganese
54.938(1)
2 8 13 2
3d54s2
123456789a1234
26 3d-5
Fe
Iron
55.845
2 8 14 2
3d64s2
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27 3d-5
Co
Cobalt
58.933(1)
2 8 15 2
3d74s2
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28 3d-5
Ni
Nickel
58.693
2 8 16 2
3d84s2
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29 3d-5
Cu
Copper
63.546
2 8 18 1
3d104s1
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30 3d-5
Zn
Zinc
65.38
2 8 18 2
3d104s2
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31 4p-5
Ga
Gallium
69.723
2 8 18 3
4s24p1
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32 4p-5
Ge
Germanium
72.630
2 8 18 4
4s24p2
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33 4p-5
As
Arsenic
74.922(1)
2 8 18 5
4s24p3
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34 4p-5
Se
Selenium
78.971
2 8 18 6
4s24p4
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35 4p-5
Br
Bromine
79.904
2 8 18 7
4s24p5
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36 4p-5
Kr
Krypton
83.798
2 8 18 8
4s24p6
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37 5s-5
Rb
Rubidium
85.468
2 8 18 8 1
5s1
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38 5s-5
Sr
Strontium
87.62
2 8 18 8 2
5s2
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39 4d-6
Y
Yttrium
88.906(1)
2 8 18 9 2
4d15s2
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40 4d-6
Zr
Zirconium
91.224
2 8 18 10 2
4d25s2
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41 4d-6
Nb
Niobium
92.906(1)
2 8 18 12 1
4d45s1
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42 4d-6
Mo
Molybdenum
95.95
2 8 18 13 1
4d55s1
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43 4d-6
Tc
Technetium
(97)
2 8 18 13 2
4d55s2
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44 4d-6
Ru
Ruthenium
101.07
2 8 18 15 1
4d75s1
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45 4d-6
Rh
Rhodium
102.91(1)
2 8 18 16 1
4d85s1
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46 4d-6
Pd
Palladium
106.42
2 8 18 18
4d10
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47 4d-6
Ag
Silver
107.87
2 8 18 18 1
4d105s1
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48 4d-6
Cd
Cadmium
112.41
2 8 18 18 2
4d105s2
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49 5p-6
In
Indium
114.82
2 8 18 18 3
5s25p1
123456789a1234
50 5p-6
Sn
Tin
118.71
2 8 18 18 4
5s25p2
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51 5p-6
Sb
Antimony
121.76
2 8 18 18 5
5s25p3
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52 5p-6
Te
Tellurium
127.60
2 8 18 18 6
5s25p4
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53 5p-6
I
Iodine
126.90(1)
2 8 18 18 7
5s25p5
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54 5p-6
Xe
Xenon
131.29
2 8 18 18 8
5s25p6
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55 6s-6
Cs
Cesium
132.915(1)
2 8 18 18 8 1
6s1
123456789a1234
56 6s-6
Ba
Barium
137.33
2 8 18 18 8 2
6s2
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57 5d-7
La
Lanthanum
138.91
2 8 18 18 9 2
5d16s2
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58 4f-7
Ce
Cerium
140.12
2 8 18 19 9 2
4f15d16s2
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59 4f-7
Pr
Praseodymium
140.91(1)
2 8 18 21 8 2
4f36s2
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60 4f-7
Nd
Neodymium
144.24
2 8 18 22 8 2
4f46s2
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61 4f-7
Pm
Promethium
(145)
2 8 18 23 8 2
4f56s2
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62 4f-7
Sm
Samarium
150.36
2 8 18 24 8 2
4f66s2
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63 4f-7
Eu
Europium
151.96
2 8 18 25 8 2
4f76s2
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64 4f-7
Gd
Gadolinium
157.25
2 8 18 25 9 2
4f75d16s2
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65 4f-7
Tb
Terbium
158.93(1)
2 8 18 27 8 2
4f96s2
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66 4f-7
Dy
Dysprosium
162.50
2 8 18 28 8 2
4f106s2
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67 4f-7
Ho
Holmium
164.93(1)
2 8 18 29 8 2
4f116s2
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68 4f-7
Er
Erbium
167.26
2 8 18 30 8 2
4f126s2
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69 4f-7
Tm
Thulium
168.93(1)
2 8 18 32 8 1
4f136s2
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70 4f-7
Yb
Ytterbium
173.05
2 8 18 32 8 2
4f146s2
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71 4f-7
Lu
Lutetium
174.97
2 8 18 32 9 2
5d16s2
123456789a1234
72 5d-7
Hf
Hafnium
178.49
2 8 18 32 10 2
5d26s2
123456789a1234
73 5d-7
Ta
Tantalum
180.95
2 8 18 32 11 2
5d36s2
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74 5d-7
W
Tungsten
183.84
2 8 18 32 12 2
5d46s2
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75 5d-7
Re
Rhenium
186.21
2 8 18 32 13 2
5d56s2
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76 5d-7
Os
Osmium
190.23
2 8 18 32 14 2
5d66s2
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77 5d-7
Ir
Iridium
192.22
2 8 18 32 15 2
5d76s2
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78 5d-7
Pt
Platinum
195.08
2 8 18 32 17 1
5d96s1
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79 5d-7
Au
Gold
196.97(1)
2 8 18 32 18 1
5d106s1
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80 5d-7
Hg
Mercury
200.59
2 8 18 32 18 2
5d106s2
123456789a1234
81 6p-7
Tl
Thallium
204.38
2 8 18 32 18 3
6s26p1
123456789a1234
82 6p-7
Pb
Lead
207.2
2 8 18 32 18 4
6s26p2
123456789a1234
83 6p-7
Bi
Bismuth
208.98(1)
2 8 18 32 18 5
6s26p3
123456789a1234
84 6p-7
Po
Polonium
(909)
2 8 18 32 18 6
6s26p4
123456789a1234
85 6p-7
At
Astatine
(910)
2 8 18 32 18 7
6s26p5
123456789a1234
86 6p-7
Rn
Radon
(222)
2 8 18 32 18 8
6s26p6
123456789a1234
87 7s-7
Fr
Francium
(223)
2 8 18 32 18 8 1
7s1
123456789a1234
88 7s-7
Ra
Radium
(226)
2 8 18 32 18 8 2
7s2
123456789a1234
89 6d-8
Ac
Actinium
(227)
2 8 18 32 18 9 2
6d17s2
123456789a1234
90 5f-8
Th
Thorium
232.04
2 8 18 32 18 10 2
6d27s2
123456789a1234
91 5f-8
Pa
Protactinium
231.04(1)
2 8 18 32 20 9 2
5f26d17s2
123456789a1234
92 5f-8
U
Uranium
238.03
2 8 18 32 21 9 2
5f36d17s2
123456789a1234
93 5f-8
Np
Neptunium
(237)
2 8 18 32 22 9 2
5f46d17s2
123456789a1234
94 5f-8
Pu
Plutonium
(244)
2 8 18 32 24 8 2
5f67s2
123456789a1234
95 5f-8
Am
Americium
(243)
2 8 18 32 25 8 2
5f77s2
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96 5f-8
Cm
Curium
(247)
2 8 18 32 25 9 2
5f76d17s2
123456789a1234
97 5f-8
Bk
Berkelium
(247)
2 8 18 32 27 8 2
5f97s2
123456789a1234
98 5f-8
Cf
Californium
(251)
2 8 18 32 28 8 2
5f107s2
123456789a1234
99 5f-8
Es
Einsteinium
(252)
2 8 18 32 29 8 2
5f117s2
123456789a1234
100 5f-8
Fm
Fermium
(257)
2 8 18 32 30 8 2
5f127s2
123456789a1234
101 5f-8
Md
Mendelevium
(258)
2 8 18 32 31 8 2
5f137s2
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102 5f-8
No
Nobelium
(259)
2 8 18 32 32 8 2
5f147s2
123456789a1234
103 5f-8
Lr
Lawrencium
(266)
2 8 18 32 32 8 3
7s27p1
123456789a1234
104  6d-8
Rf
Rutherfordium
(267)
2 8 18 32 32 10 2
6d27s2
123456789a1234
105 6d-8
Db
Dubnium
(268)
2 8 18 32 32 11 2
6d37s2
123456789a1234
106 6d-8
Sg
Seaborgium
(269)
2 8 18 32 32 12 2
6d47s2
123456789a1234
107 6d-8
Bh
Bohrium
(270)
2 8 18 32 32 13 2
6d57s2
123456789a1234
108 6d-8
Hs
Hassium
(269)
2 8 18 32 32 14 2
6d67s2
123456789a1234
109 6d-8
Mt
Meitnerium
(278)
2 8 18 32 32 15 2
6d77s2
123456789a1234
110 6d-8
Ds
Darmstadtium
(281)
2 8 18 32 32 17 1
6d97s1
123456789a1234
111 6d-8
Rg
Roentgenium
(282)
2 8 18 32 32 17 2
6d107s1
123456789a1234
112 6d-8
Cn
Copernicium
(285)
2 8 18 32 32 18 2
6d107s2
123456789a1234
113 7p-8
Nh
Nihonium
(286)
2 8 18 32 32 18 3
7s27p1
123456789a1234
114 7p-8
Fl
Flerovium
(289)
2 8 18 32 32 18 4
7s27p2
123456789a1234
115 7p-8
Mc
Moscovium
(289)
2 8 18 32 32 18 5
7s27p3
123456789a1234
116 7p-8
Lv
Livermorium
(293)
2 8 18 32 32 18 6
7s27p4
123456789a1234
117 7p-8
Ts
Tennessine
(294)
2 8 18 32 32 18 7
7s27p5
123456789a1234
118 7p-8
Og
Oganesson
(294)
2 8 18 32 32 18 8
7s27p6
123456789a1234
119 8s-8
Uue
Ununennium
2 8 18 32 32 18 8 1
8s1
123456789a1234
120 8s-8
Ubn
Unbinilium
2 8 18 32 32 18 8 2
8s2
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19
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20
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21
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22
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23
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24
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25
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26
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27
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28
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29
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30
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31
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32
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9
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10
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11
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12
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13
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14
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15
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16
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17
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18
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3
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4
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5
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6
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7
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8
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1
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2
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