| 1A | 2A | 3A | 4A | 5A | 6A | 7A | 8A | ||||||||||||
| (1) | (2) | (13) | (14) | (15) | (16) | (17) | (18) | ||||||||||||
| 3B | 4B | 5B | 6B | 7B | — | 8B | — | 1B | 2B | ||||||||||
| (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | ||||||||||
| 1 | H | He | |||||||||||||||||
| 2 | Li | Be | B | C | N | O | F | Ne | |||||||||||
| 3 | Na | Mg | Al | Si | P | S | Cl | Ar | |||||||||||
| 4 | K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr | |
| 5 | Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe | |
| 6 | Cs | Ba | La | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn | |
| 7 | Fr | Ra | Ac | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Uub | — | Uuq | — | — | — | — | |
| 6 | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | |||||
| 7 | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |
|
Atomic Number |
Symbol |
Name |
Relative Abundance |
Abundance in the Universe (parts per billion) |
| 1 | H | Hydrogen | 1 | 750,000,000 |
| 2 | He | Helium | 2 | 230,000,000 |
| 8 | O | Oxygen | 3 | 10,000,000 |
| 6 | C | Carbon | 4 | 5,000,000 |
| 10 | Ne | Neon | 5 | 1,300,000 |
| 26 | Fe | Iron | 6 | 1,100,000 |
| 7 | N | Nitrogen | 7 | 1,000,000 |
| 14 | Si | Silicon | 8 | 700,000 |
| 12 | Mg | Magnesium | 9 | 600,000 |
| 16 | S | Sulfur | 10 | 500,000 |
| 18 | Ar | Argon | 11 | 200,000 |
| 20 | Ca | Calcium | 12 | 70,000 |
| 28 | Ni | Nickel | 13 | 60,000 |
| 13 | Al | Aluminum | 14 | 50,000 |
| 11 | Na | Sodium | 15 | 20,000 |
| 24 | Cr | Chromium | 16 | 15,000 |
| 25 | Mn | Manganese | 17 | 8,000 |
| 15 | P | Phosphorus | 18 | 7,000 |
| 19 | K | Potassium | 19 | 3,000 |
| 22 | Ti | Titanium | 20 | 3,000 |
| 27 | Co | Cobalt | 21 | 3,000 |
| 17 | Cl | Chlorine | 22 | 1,000 |
| 23 | V | Vanadium | 23 | 1,000 |
| 9 | F | Fluorine | 24 | 400 |
| 30 | Zn | Zinc | 25 | 300 |
| 32 | Ge | Germanium | 26 | 200 |
| 29 | Cu | Copper | 27 | 60 |
| 40 | Zr | Zirconium | 28 | 50 |
| 36 | Kr | Krypton | 29 | 40 |
| 38 | Sr | Strontium | 30 | 40 |
| 21 | Sc | Scandium | 31 | 30 |
| 34 | Se | Selenium | 32 | 30 |
| 31 | Ga | Gallium | 33 | 10 |
| 37 | Rb | Rubidium | 34 | 10 |
| 54 | Xe | Xenon | 35 | 10 |
| 56 | Ba | Barium | 36 | 10 |
| 58 | Ce | Cerium | 37 | 10 |
| 60 | Nd | Neodymium | 38 | 10 |
| 82 | Pb | Lead | 39 | 10 |
| 52 | Te | Tellurium | 40 | 9 |
| 33 | As | Arsenic | 41 | 8 |
| 35 | Br | Bromine | 42 | 7 |
| 39 | Y | Yttrium | 43 | 7 |
| 3 | Li | Lithium | 44 | 6 |
| 42 | Mo | Molybdenum | 45 | 5 |
| 62 | Sm | Samarium | 46 | 5 |
| 78 | Pt | Platinum | 47 | 5 |
| 44 | Ru | Ruthenium | 48 | 4 |
| 50 | Sn | Tin | 49 | 4 |
| 76 | Os | Osmium | 50 | 3 |
| 41 | Nb | Niobium | 51 | 2 |
| 46 | Pd | Palladium | 52 | 2 |
| 48 | Cd | Cadmium | 53 | 2 |
| 57 | La | Lanthanum | 54 | 2 |
| 59 | Pr | Praseodymium | 55 | 2 |
| 64 | Gd | Gadolinium | 56 | 2 |
| 66 | Dy | Dysprosium | 57 | 2 |
| 68 | Er | Erbium | 58 | 2 |
| 70 | Yb | Ytterbium | 59 | 2 |
| 77 | Ir | Iridium | 60 | 2 |
| 4 | Be | Beryllium | 61 | 1 |
| 5 | B | Boron | 62 | 1 |
| 53 | I | Iodine | 63 | 1 |
| 80 | Hg | Mercury | 64 | 1 |
| 55 | Cs | Cesium | 65 | 0.8 |
| 72 | Hf | Hafnium | 66 | 0.7 |
| 83 | Bi | Bismuth | 67 | 0.7 |
| 45 | Rh | Rhodium | 68 | 0.6 |
| 47 | Ag | Silver | 69 | 0.6 |
| 79 | Au | Gold | 70 | 0.6 |
| 63 | Eu | Europium | 71 | 0.5 |
| 65 | Tb | Terbium | 72 | 0.5 |
| 67 | Ho | Holmium | 73 | 0.5 |
| 74 | W | Tungsten | 74 | 0.5 |
| 81 | Tl | Thallium | 75 | 0.5 |
| 51 | Sb | Antimony | 76 | 0.4 |
| 90 | Th | Thorium | 77 | 0.4 |
| 49 | In | Indium | 78 | 0.3 |
| 75 | Re | Rhenium | 79 | 0.2 |
| 92 | U | Uranium | 80 | 0.2 |
| 69 | Tm | Thulium | 81 | 0.1 |
| 71 | Lu | Lutetium | 82 | 0.1 |
| 73 | Ta | Tantalum | 83 | 0.08 |
| The following elements
are radioactive, and are found in only trace amounts in the Universe at large |
||||
| 89 | Ac | Actinium | —— | traces |
| 85 | At | Astatine | —— | traces |
| 87 | Fr | Francium | —— | traces |
| 93 | Np | Neptunium | —— | traces |
| 94 | Pu | Plutonium | —— | traces |
| 84 | Po | Polonium | —— | traces |
| 61 | Pm | Promethium | —— | traces |
| 91 | Pa | Protactinium | —— | traces |
| 88 | Ra | Radium | —— | traces |
| 86 | Rn | Radon | —— | traces |
| 43 | Tc | Technetium | —— | traces |
| The following elements
are produced artificially, and are not found naturally in the Universe |
||||
| 95 | Am | Americium | —— | 0 |
| 97 | Bk | Berkelium | —— | 0 |
| 107 | Bh | Bohrium | —— | 0 |
| 98 | Cf | Californium | —— | 0 |
| 96 | Cm | Curium | —— | 0 |
| 110 | Ds | Darmstadtium | —— | 0 |
| 105 | Db | Dubnium | —— | 0 |
| 99 | Es | Einsteinium | —— | 0 |
| 100 | Fm | Fermium | —— | 0 |
| 108 | Hs | Hassium | —— | 0 |
| 103 | Lr | Lawrencium | —— | 0 |
| 109 | Mt | Meitnerium | —— | 0 |
| 101 | Md | Mendelevium | —— | 0 |
| 102 | No | Nobelium | —— | 0 |
| 111 | Rg | Roentgenium | —— | 0 |
| 104 | Rf | Rutherfordium | —— | 0 |
| 106 | Sg | Seaborgium | —— | 0 |
| 112 | Uub | Ununbiium | —— | 0 |
| 114 | Uuq | Ununquadium | —— | 0 |
Data taken from Web Elements TM

|
Atomic Number |
Symbol |
Name |
Abundance in Earth's Atmosphere (by volume) |
|
7 |
N |
Nitrogen |
78.09% (780,900 ppm) |
|
8 |
O |
Oxygen |
20.95% (209,500 ppm) |
|
18 |
Ar |
Argon |
0.93% (9,300 ppm) |
|
1 |
H |
Hydrogen |
0.5 ppm as H2 variable as H2O(g) |
|
6 |
C |
Carbon |
350 ppm as CO2 1.6 ppm as CH4 0.25 ppm as CO |
|
17 |
Cl |
Chlorine |
variable; traces in sea spray and organochlorine compounds |
|
10 |
Ne |
Neon |
18 ppm |
|
2 |
He |
Helium |
5.2 ppm |
|
36 |
Kr |
Krypton |
1.14 ppm |
|
54 |
Xe |
Xenon |
0.086 ppm |
|
9 |
F |
Fluorine |
6´10-6 ppm as organofluorine compounds |
| 86 | Rn | Radon | 1´10-15 ppm |
Data taken from John Emsley, Nature's Building Blocks: An A-Z Guide to the Elements. Oxford: Oxford University Press, 2001 and John Emsley, The Elements, 3rd edition. Oxford: Clarendon Press, 1998.
|
Atomic Number |
Symbol |
Name |
Relative Abundance in Crust |
Crust (by mass) |
Mantle (by mass) |
Core (by mass) |
|
8 |
O |
Oxygen |
1 |
47.4% (474,000 ppm) |
44.8% | |
|
14 |
Si |
Silicon |
2 |
27.7% (277,000 ppm) |
21.5% | |
|
13 |
Al |
Aluminum |
3 |
8.2% (82,000 ppm) |
2.2% | |
|
26 |
Fe |
Iron |
4 |
4.1% (41,000 ppm) |
5.8% | 80-85% |
|
20 |
Ca |
Calcium |
5 |
4.1% (41,000 ppm) |
2.3% | |
|
11 |
Na |
Sodium |
6 |
2.3% (23,000 ppm) |
0.3% | |
|
12 |
Mg |
Magnesium |
7 |
2.3% (23,000 ppm) |
22.8% | |
|
19 |
K |
Potassium |
8 |
2.1% (21,000 ppm) |
0.03% | |
|
22 |
Ti |
Titanium |
9 |
0.56 % (5,600 ppm) |
||
|
1 |
H |
Hydrogen |
10 |
0.152% (1,520 ppm) |
||
|
15 |
P |
Phosphorus |
11 |
0.1% (1000 ppm) |
||
|
25 |
Mn |
Manganese |
12 |
0.95% (950 ppm) |
||
|
9 |
F |
Fluorine |
13 |
0.95% (950 ppm) |
||
|
56 |
Ba |
Barium |
14 |
500 ppm |
||
|
6 |
C |
Carbon |
15 |
480 ppm |
||
|
38 |
Sr |
Strontium |
16 |
370 ppm |
||
|
16 |
S |
Sulfur |
17 |
260 ppm |
||
|
40 |
Zr |
Zirconium |
18 |
190 ppm |
||
|
23 |
V |
Vanadium |
19 |
160 ppm |
||
|
17 |
Cl |
Chlorine |
20 |
130 ppm |
||
|
24 |
Cr |
Chromium |
21 |
100 ppm |
||
|
37 |
Rb |
Rubidium |
22 |
90 ppm |
||
|
28 |
Ni |
Nickel |
23 |
80 ppm |
5-10% | |
|
30 |
Zn |
Zinc |
24 |
75 ppm |
||
|
58 |
Ce |
Cerium |
25 |
68 ppm |
||
|
29 |
Cu |
Copper |
26 |
50 ppm |
||
|
60 |
Nd |
Neodymium |
27 |
38 ppm |
||
|
57 |
La |
Lanthanum |
28 |
32 ppm |
||
|
39 |
Y |
Yttrium |
29 |
30 ppm |
||
|
7 |
N |
Nitrogen |
30 |
25 ppm |
||
|
3 |
Li |
Lithium |
31 |
20 ppm |
||
|
27 |
Co |
Cobalt |
32 |
20 ppm |
||
|
41 |
Nb |
Niobium |
33 |
20 ppm |
||
|
31 |
Ga |
Gallium |
34 |
18 ppm |
||
|
21 |
Sc |
Scandium |
35 |
16 ppm |
||
|
82 |
Pb |
Lead |
36 |
14 ppm |
||
|
90 |
Th |
Thorium |
37 |
12 ppm |
||
|
5 |
B |
Boron |
38 |
10 ppm |
||
|
59 |
Pr |
Praseodymium |
39 |
9.5 ppm |
||
|
62 |
Sm |
Samarium |
40 |
7.9 ppm |
||
|
64 |
Gd |
Gadolinium |
41 |
7.7 ppm |
||
|
66 |
Dy |
Dysprosium |
42 |
6 ppm |
||
|
70 |
Yb |
Ytterbium |
43 |
5.3 ppm |
||
|
68 |
Er |
Erbium |
44 |
3.8 ppm |
||
|
72 |
Hf |
Hafnium |
45 |
3.3 ppm |
||
|
55 |
Cs |
Cesium |
46 |
3 ppm |
||
|
4 |
Be |
Beryllium |
47 |
2.6 ppm |
||
|
92 |
U |
Uranium |
48 |
2.4 ppm |
||
|
50 |
Sn |
Tin |
49 |
2.2 ppm |
||
|
63 |
Eu |
Europium |
50 |
2.1 ppm |
||
|
73 |
Ta |
Tantalum |
51 |
2 ppm |
||
|
32 |
Ge |
Germanium |
52 |
1.8 ppm |
||
|
33 |
As |
Arsenic |
53 |
1.5 ppm |
||
|
42 |
Mo |
Molybdenum |
54 |
1.5 ppm |
||
|
67 |
Ho |
Holmium |
55 |
1.4 ppm |
||
|
18 |
Ar |
Argon |
56 |
1.2 ppm |
||
|
65 |
Tb |
Terbium |
57 |
1.1 ppb |
||
|
74 |
W |
Tungsten |
58 |
1 ppm |
||
|
81 |
Tl |
Thallium |
59 |
0.6 ppm |
||
|
71 |
Lu |
Lutetium |
60 |
0.51 ppm |
||
|
69 |
Tm |
Thulium |
61 |
0.48 ppm |
||
|
35 |
Br |
Bromine |
62 |
0.37 ppm |
||
|
51 |
Sb |
Antimony |
63 |
0.2 ppm |
||
|
53 |
I |
Iodine |
64 |
0.14 ppm |
||
|
48 |
Cd |
Cadmium |
65 |
0.11 ppm |
||
|
47 |
Ag |
Silver |
66 |
0.07 ppm (70 ppb) |
||
|
34 |
Se |
Selenium |
67 |
0.05 ppm (50 ppb) |
||
|
80 |
Hg |
Mercury |
68 |
0.05 ppm (50 ppb) |
||
|
49 |
In |
Indium |
69 |
0.049 ppm (49 ppb) |
||
|
83 |
Bi |
Bismuth |
70 |
0.048 ppm (48 ppb) |
||
|
2 |
He |
Helium |
71 |
0.008 ppm (8 ppb) |
||
|
52 |
Te |
Tellurium |
72 |
0.005 ppm (5 ppb) |
||
|
79 |
Au |
Gold |
73 |
0.0011 ppm (1.1 ppb) |
||
|
44 |
Ru |
Ruthenium |
74 |
0.001 ppm (1 ppb) |
||
|
78 |
Pt |
Platinum |
75 |
0.001 ppm (1 ppb) |
||
|
46 |
Pd |
Palladium |
76 |
6´10-4 ppm (0.6 ppb) |
||
|
75 |
Re |
Rhenium |
77 |
4´10-4 ppm (0.4 ppb) |
||
|
45 |
Rh |
Rhodium |
78 |
2´10-4 ppm (0.2 ppb) |
||
|
76 |
Os |
Osmium |
79 |
1´10-4 ppm (0.1 ppb) |
||
|
10 |
Ne |
Neon |
80 |
7´10-5 ppm (70 ppt) |
||
|
36 |
Kr |
Krypton |
81 |
1´10-5 ppm (10 ppt) |
||
|
77 |
Ir |
Iridium |
82 |
3´10-6 ppm (3 ppt) |
||
|
54 |
Xe |
Xenon |
83 |
2´10-6 ppm (2 ppt) |
||
|
88 |
Ra |
Radium |
84 |
6´10-7 ppm (0.6 ppt) |
||
|
The following elements are radioactive, and are found in only trace amounts on the Earth |
||||||
|
89 |
Ac |
Actinium |
—— |
traces |
||
|
85 |
At |
Astatine |
—— |
traces |
||
|
87 |
Fr |
Francium |
—— |
traces |
||
|
93 |
Np |
Neptunium |
—— |
traces |
||
|
94 |
Pu |
Plutonium |
—— |
traces |
||
|
84 |
Po |
Polonium |
—— |
traces |
||
|
61 |
Pm |
Promethium |
—— |
traces |
||
|
91 |
Pa |
Protactinium |
—— |
traces |
||
|
86 |
Rn |
Radon |
—— |
traces |
||
|
43 |
Tc |
Technetium |
—— |
traces |
||
|
The following elements are produced artificially, and are not found naturally on the Earth |
||||||
|
95 |
Am |
Americium |
—— |
none |
||
|
97 |
Bk |
Berkelium |
—— |
none |
||
|
107 |
Bh |
Bohrium |
—— |
none |
||
|
98 |
Cf |
Californium |
—— |
none |
||
|
96 |
Cm |
Curium |
—— |
none |
||
|
110 |
Ds |
Darmstadtium |
—— |
none |
||
|
105 |
Db |
Dubnium |
—— |
none |
||
|
99 |
Es |
Einsteinium |
—— |
none |
||
|
100 |
Fm |
Fermium |
—— |
none |
||
|
108 |
Hs |
Hassium |
—— |
none |
||
|
103 |
Lr |
Lawrencium |
—— |
none |
||
|
109 |
Mt |
Meitnerium |
—— |
none |
||
|
101 |
Md |
Mendelevium |
—— |
none |
||
|
102 |
No |
Nobelium |
—— |
none |
||
|
111 |
Rg |
Roentgenium |
—— |
none |
||
|
104 |
Rf |
Rutherfordium |
—— |
none |
||
|
106 |
Sg |
Seaborgium |
—— |
none |
||
|
112 |
Uub |
Ununbiium |
—— |
none |
||
|
114 |
Uuq |
Ununquadium |
—— |
none |
||
Data taken from John Emsley, Nature's Building Blocks: An A-Z Guide to the Elements. Oxford: Oxford University Press, 2001 and John Emsley, The Elements, 3rd edition. Oxford: Clarendon Press, 1998.

|
Atomic Number |
Symbol |
Name |
Relative Abundance |
Amount (grams) |
| 8 | O | Oxygen | 1 | 43000 |
| 6 | C | Carbon | 2 | 16000 |
| 1 | H | Hydrogen | 3 | 7000 |
| 7 | N | Nitrogen | 4 | 1800 |
| 20 | Ca | Calcium | 5 | 1200 |
| 15 | P | Phosphorus | 6 | 780 |
| 16 | S | Sulfur | 7 | 140 |
| 19 | K | Potassium | 8 | 110 - 140 |
| 11 | Na | Sodium | 9 | 100 |
| 17 | Cl | Chlorine | 10 | 95 |
| 12 | Mg | Magnesium | 11 | 25 |
| 26 | Fe | Iron | 12 | 4 |
| 9 | F | Fluorine | 13 | 3 - 6 |
| 30 | Zn | Zinc | 14 | 2.3 |
| 14 | Si | Silicon | 15 | 1 |
| 22 | Ti | Titanium | 16 | 0.7 |
| 37 | Rb | Rubidium | 17 | 0.68 |
| 38 | Sr | Strontium | 18 | 0.32 |
| 35 | Br | Bromine | 19 | 0.26 |
| 82 | Pb | Lead | 20 | 0.12 |
| 29 | Cu | Copper | 21 | 0.07 |
| 58 | Ce | Cerium | 22 | 0.04 |
| 90 | Th | Thorium | 23 | 0.04 |
| 50 | Sn | Tin | 24 | 0.03 |
| 56 | Ba | Barium | 25 | 0.022 |
| 48 | Cd | Cadmium | 26 | 0.02 |
| 74 | W | Tungsten | 27 | 0.02 |
| 5 | B | Boron | 28 | 0.018 |
| 28 | Ni | Nickel | 29 | 0.015 |
| 34 | Se | Selenium | 30 | 0.014 |
| 25 | Mn | Manganese | 31 | 0.012 |
| 53 | I | Iodine | 32 | 0.01 - 0.02 |
| 33 | As | Arsenic | 33 | 0.007 |
| 3 | Li | Lithium | 34 | 0.007 |
| 80 | Hg | Mercury | 35 | 0.006 |
| 55 | Cs | Cesium | 36 | 0.006 |
| 32 | Ge | Germanium | 37 | 0.005 |
| 42 | Mo | Molybdenum | 38 | 0.005 |
| 47 | Ag | Silver | 39 | 0.002 |
| 51 | Sb | Antimony | 40 | 0.002 |
| 41 | Nb | Niobium | 41 | 0.0015 |
| 24 | Cr | Chromium | 42 | 0.001 - 0.002 |
| 27 | Co | Cobalt | 43 | 0.001 - 0.002 |
| 40 | Zr | Zirconium | 44 | 0.001 |
| 57 | La | Lanthanum | 45 | 0.001 |
| 31 | Ga | Gallium | 46 | <0.001 |
| 52 | Te | Tellurium | 47 | 0.0007 |
| 13 | Al | Aluminum | 48 | 0.0006 |
| 39 | Y | Yttrium | 49 | 0.0005 |
| 81 | Tl | Thallium | 50 | 0.0005 |
| 83 | Bi | Bismuth | 51 | <0.0005 |
| 49 | In | Indium | 52 | 0.0004 |
| 21 | Sc | Scandium | 53 | 0.0002 |
| 73 | Ta | Tantalum | 54 | 0.0002 |
| 79 | Au | Gold | 55 | <0.0002 |
| 23 | V | Vanadium | 56 | 0.0001 |
| 92 | U | Uranium | 57 | 0.0001 |
| 4 | Be | Beryllium | 58 | 3.50x10-5 |
| 88 | Ra | Radium | 59 | 3.00x10-11 |
| The following elements
are found in only trace amounts in the human body |
||||
| 18 | Ar | Argon | —— | traces |
| 66 | Dy | Dysprosium | —— | traces |
| 68 | Er | Erbium | —— | traces |
| 63 | Eu | Europium | —— | traces |
| 64 | Gd | Gadolinium | —— | traces |
| 72 | Hf | Hafnium | —— | traces |
| 2 | He | Helium | —— | traces |
| 67 | Ho | Holmium | —— | traces |
| 77 | Ir | Iridium | —— | traces |
| 36 | Kr | Krypton | —— | traces |
| 71 | Lu | Lutetium | —— | traces |
| 60 | Nd | Neodymium | —— | traces |
| 10 | Ne | Neon | —— | traces |
| 76 | Os | Osmium | —— | traces |
| 46 | Pd | Palladium | —— | traces |
| 78 | Pt | Platinum | —— | traces |
| 59 | Pr | Praseodymium | —— | traces |
| 75 | Re | Rhenium | —— | traces |
| 45 | Rh | Rhodium | —— | traces |
| 44 | Ru | Ruthenium | —— | traces |
| 62 | Sm | Samarium | —— | traces |
| 65 | Tb | Terbium | —— | traces |
| 69 | Tm | Thulium | —— | traces |
| 54 | Xe | Xenon | —— | traces |
| 70 | Yb | Ytterbium | —— | traces |
| The following elements
are either radioactive, or are produced artificially,and are not normally found in the human body (although some do have medical applications) |
||||
| 89 | Ac | Actinium | —— | none |
| 95 | Am | Americium | —— | none |
| 85 | At | Astatine | —— | none |
| 97 | Bk | Berkelium | —— | none |
| 107 | Bh | Bohrium | —— | none |
| 98 | Cf | Californium | —— | none |
| 96 | Cm | Curium | —— | none |
| 110 | Ds | Darmstadtium | —— | none |
| 105 | Db | Dubnium | —— | none |
| 99 | Es | Einsteinium | —— | none |
| 100 | Fm | Fermium | —— | none |
| 87 | Fr | Francium | —— | none |
| 108 | Hs | Hassium | —— | none |
| 103 | Lr | Lawrencium | —— | none |
| 109 | Mt | Meitnerium | —— | none |
| 101 | Md | Mendelevium | —— | none |
| 93 | Np | Neptunium | —— | none |
| 102 | No | Nobelium | —— | none |
| 94 | Pu | Plutonium | —— | none |
| 84 | Po | Polonium | —— | none |
| 61 | Pm | Promethium | —— | none |
| 91 | Pa | Protactinium | —— | none |
| 86 | Rn | Radon | —— | none |
| 111 | Rg | Roentgenium | —— | none |
| 104 | Rf | Rutherfordium | —— | none |
| 106 | Sg | Seaborgium | —— | none |
| 43 | Tc | Technetium | —— | none |
| 112 | Uub | Ununbiium | —— | none |
| 114 | Uuq | Ununquadium | —— | none |
Data taken from John Emsley, Nature's Building Blocks: An A-Z Guide to the Elements. Oxford: Oxford University Press, 2001.
