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Includes interactive visualizations, properties, orbitals, isotopes, and compound mixing.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Pnictogens 16 Chalcogens 17 Halógenar 18
1 1 H Vetni 1,0081 Atomic # Symbol Name Weight


C Föstu formi
Hg Vökvi
H Gasformi
Rf Óþekkt
Málmur Málmungur Málmleysingi
Alkalímálmur Jarðalkalímálmur Lantaníð Hliðarmálmur Post-transition metals Málmleysingi Eðallofttegund
Aktiníð
Kelvin
°Selsíus
°Fahrenheit
7s
6s
5s
4s
3s
2s
1s
7p
6p
5p
4p
3p
2p
6d
5d
4d
3d
=
m=
n=
5f
4f
s
p
d
f
α Alfasundrun β− Betasundrun
p Proton emission β+ Positron emission
n Neutron emission K+ Electron capture
SF Spontaneous fission   Stable
2 He Helín 4,00262 K
2 3 Li Litín 6,942
1
4 Be Beryllín 9,01222
2
5 B Bór 10,812
3
6 C Kolefni 12,0112
4
7 N Nitur 14,0072
5
8 O Súrefni 15,9992
6
9 F Flúor 18,9982
7
10 Ne Neon 20,1802
8
K
L
3 11 Na Natrín 22,9902
8
1
12 Mg Magnesín 24,3052
8
2
13 Al Ál 26,9822
8
3
14 Si Kísill 28,0852
8
4
15 P Fosfór 30,9742
8
5
16 S Brennisteinn 32,062
8
6
17 Cl Klór 35,452
8
7
18 Ar Argon 39,9482
8
8
K
L
M
4 19 K Kalín 39,0982
8
8
1
20 Ca Kalsín 40,0782
8
8
2
21 Sc Skandín 44,9562
8
9
2
22 Ti Títan 47,8672
8
10
2
23 V Vanadín 50,9422
8
11
2
24 Cr Króm 51,9962
8
13
1
25 Mn Mangan 54,9382
8
13
2
26 Fe Járn 55,8452
8
14
2
27 Co Kóbolt 58,9332
8
15
2
28 Ni Nikkel 58,6932
8
16
2
29 Cu Kopar 63,5462
8
18
1
30 Zn Sink 65,382
8
18
2
31 Ga Gallín 69,7232
8
18
3
32 Ge German 72,6302
8
18
4
33 As Arsen 74,9222
8
18
5
34 Se Selen 78,9712
8
18
6
35 Br Bróm 79,9042
8
18
7
36 Kr Krypton 83,7982
8
18
8
K
L
M
N
5 37 Rb Rúbidín 85,4682
8
18
8
1
38 Sr Strontín 87,622
8
18
8
2
39 Y Yttrín 88,9062
8
18
9
2
40 Zr Sirkon 91,2242
8
18
10
2
41 Nb Níóbín 92,9062
8
18
12
1
42 Mo Mólýbden 95,952
8
18
13
1
43 Tc Teknetín (98)2
8
18
13
2
44 Ru Rúþen 101,072
8
18
15
1
45 Rh Ródín 102,912
8
18
16
1
46 Pd Palladín 106,422
8
18
18
47 Ag Silfur 107,872
8
18
18
1
48 Cd Kadmín 112,412
8
18
18
2
49 In Indín 114,822
8
18
18
3
50 Sn Tin 118,712
8
18
18
4
51 Sb Antimon 121,762
8
18
18
5
52 Te Tellúr 127,602
8
18
18
6
53 I Joð 126,902
8
18
18
7
54 Xe Xenon 131,292
8
18
18
8
K
L
M
N
O
6 55 Cs Sesín 132,912
8
18
18
8
1
56 Ba Barín 137,332
8
18
18
8
2
57–71 72 Hf Hafnín 178,492
8
18
32
10
2
73 Ta Tantal 180,952
8
18
32
11
2
74 W Volfram 183,842
8
18
32
12
2
75 Re Renín 186,212
8
18
32
13
2
76 Os Osmín 190,232
8
18
32
14
2
77 Ir Iridín 192,222
8
18
32
15
2
78 Pt Platína 195,082
8
18
32
17
1
79 Au Gull 196,972
8
18
32
18
1
80 Hg Kvikasilfur 200,592
8
18
32
18
2
81 Tl Þallín 204,382
8
18
32
18
3
82 Pb Blý 207,22
8
18
32
18
4
83 Bi Bismút 208,982
8
18
32
18
5
84 Po Pólon (209)2
8
18
32
18
6
85 At Astat (210)2
8
18
32
18
7
86 Rn Radon (222)2
8
18
32
18
8
K
L
M
N
O
P
7 87 Fr Fransín (223)2
8
18
32
18
8
1
88 Ra Radín (226)2
8
18
32
18
8
2
89–103 104 Rf Rutherfordín (267)2
8
18
32
32
10
2
105 Db Dubnín (268)2
8
18
32
32
11
2
106 Sg Seborgín (269)2
8
18
32
32
12
2
107 Bh Bohrín (270)2
8
18
32
32
13
2
108 Hs Hassín (277)2
8
18
32
32
14
2
109 Mt Meitnerín (278)2
8
18
32
32
15
2
110 Ds Darmstadtín (281)2
8
18
32
32
17
1
111 Rg Röntgenín (282)2
8
18
32
32
17
2
112 Cn Ununbín (285)2
8
18
32
32
18
2
113 Nh Nihonium (286)2
8
18
32
32
18
3
114 Fl Ununquadín (289)2
8
18
32
32
18
4
115 Mc Moscovium (290)2
8
18
32
32
18
5
116 Lv Ununhexín (293)2
8
18
32
32
18
6
117 Ts Tennessine (294)2
8
18
32
32
18
7
118 Og Oganesson (294)2
8
18
32
32
18
8
K
L
M
N
O
P
Q
For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses.
57 La Lantan 138,912
8
18
18
9
2
58 Ce Serín 140,122
8
18
19
9
2
59 Pr Praseódým 140,912
8
18
21
8
2
60 Nd Neódým 144,242
8
18
22
8
2
61 Pm Prómetín (145)2
8
18
23
8
2
62 Sm Samarín 150,362
8
18
24
8
2
63 Eu Evrópín 151,962
8
18
25
8
2
64 Gd Gadólín 157,252
8
18
25
9
2
65 Tb Terbín 158,932
8
18
27
8
2
66 Dy Dysprósín 162,502
8
18
28
8
2
67 Ho Hólmín 164,932
8
18
29
8
2
68 Er Erbín 167,262
8
18
30
8
2
69 Tm Túlín 168,932
8
18
31
8
2
70 Yb Ytterbín 173,052
8
18
32
8
2
71 Lu Lútetín 174,972
8
18
32
9
2
89 Ac Aktín (227)2
8
18
32
18
9
2
90 Th Þórín 232,042
8
18
32
18
10
2
91 Pa Prótaktín 231,042
8
18
32
20
9
2
92 U Úran 238,032
8
18
32
21
9
2
93 Np Neptúnín (237)2
8
18
32
22
9
2
94 Pu Plúton (244)2
8
18
32
24
8
2
95 Am Ameríkín (243)2
8
18
32
25
8
2
96 Cm Kúrín (247)2
8
18
32
25
9
2
97 Bk Berkelín (247)2
8
18
32
27
8
2
98 Cf Kalifornín (251)2
8
18
32
28
8
2
99 Es Einsteinín (252)2
8
18
32
29
8
2
100 Fm Fermín (257)2
8
18
32
30
8
2
101 Md Mendelevín (258)2
8
18
32
31
8
2
102 No Nóbelín (259)2
8
18
32
32
8
2
103 Lr Lawrensín (266)2
8
18
32
32
8
3

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