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Glossary
Elemental Abundances
Nuclear reactions within stars are continually
building "heavy" elements (up the Fe) via fusion.
Many of the "very heavy" elements (above Fe; made in Supernovae)
are radioactively decaying.
Thus the relative abundance of the various elements obviously depends
where (& when) one looks.
Solar Abundances
|
Element
|
Symbol
|
Atomic #
|
Abun/Hydrogen
|
|
Hydrogen
|
H
|
1
|
1
|
|
Helium
|
He
|
2
|
9.8x10-2
|
|
Lithium
|
Li
|
3
|
1.4x10-11
|
|
Beryllium
|
Be
|
4
|
1.4x10-11
|
|
Boron
|
B
|
5
|
4.0x10-10
|
|
Carbon
|
C
|
6
|
3.6x10-4
|
|
Nitrogen
|
N
|
7
|
1.1x10-4
|
|
Oxygen
|
O
|
8
|
8.5x10-4
|
|
Fluorine
|
F
|
9
|
3.6x10-8
|
|
Neon
|
Ne
|
10
|
1.2x10-4
|
|
Sodium
|
Na
|
1a
|
2.3x10-6
|
|
Magnesium
|
Mg
|
12
|
3.8x10-5
|
|
Aluminium
|
Al
|
13
|
3.0x10-6
|
|
Silicon
|
Si
|
14
|
3.5x10-5
|
|
Phospherus
|
P
|
15
|
2.8x10-7
|
|
Sulphur
|
S
|
16
|
1.6x10-5
|
|
Chlorine
|
Cl
|
17
|
3.1x10-7
|
|
Argon
|
Ar
|
18
|
3.5x10-6
|
|
Potassium
|
K
|
19
|
1.3x10-7
|
|
Calcium
|
Ca
|
20
|
2.3x10-6
|
|
Scandium
|
Sc
|
21
|
1.3x10-9
|
|
Titanium
|
Ti
|
22
|
9.8x10-8
|
|
Vanadium
|
V
|
23
|
1.0x10-8
|
|
Chromium
|
Cr
|
24
|
4.7x10-7
|
|
Manganese
|
Mn
|
25
|
2.5x10-7
|
|
Iron
|
Fe
|
26
|
3.47x10-5
|
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