Nucleosynthesis

Discussion

alpha
number
mass
number
element(s) comments
1 4 He helium formed in all stars
2 8     no stable isotopes with this mass number
3 12 C carbon triple alpha process
4 16 O oxygen  
5 20 Ne neon  
6 24 Mg magnesium  
7 28 Si silicon  
8 32 S sulfur most abundant isotope of sulfur
9
 
36
 
S
Ar
sulfur
argon
0.02% of all sulfur atoms
most abundant isotope of solar argon
10

 
40

 
Ar
K
Ca
argon
potassium
calcium
most abundant isotope of atmospheric argon
0.01% of all potassium atoms
most abundant isotope of calcium
11 44 Ca calcium 2.1% of all calcium atoms
12
 
48
 
Ca
T
calcium
titanium
0.19% of all calcium atoms
 
13 52 Cr chromium  
14 56 Fe iron nuclear "ash"
Stable isotopes built from helium nuclei (alpha particles)
lifetime remaining core temperature core reaction
10,000,000 years   1H  ⇒  4He
1,000,000 years 170,000,000 K 4He  ⇒  12C, 16O
1,000 years   12C  ⇒  20Ne, 24Mg
10 years 1,500,000,000 K 20Ne  ⇒  16O, 24Mg
1 year 2,000,000,000 K 16O  ⇒  28Si, 32S
1 day 3,000,000,000 K 28Si, 32S  ⇒  56Fe, 56Ni
1 s explosive fusion
neutron capture
 ⇒ 
 ⇒ 
light elements
heavy elements
Core nuclear reactions in massive stars

How to Cook Everything

Mix it all up and get everything from hydrogen to uranium (and maybe even up to californium).

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rank element per million kg per million atoms
1 H hydrogen 750,000 930,000
2 He helium 230,000 72,000
3 O oxygen 10,000 800
4 C carbon 5,000 500
5 Ne neon 1,300 80
6 Fe iron 1,100 20
7 N nitrogen 1,000 90
8 Si silicon 700 30
9 Mg magnesium 600 30
10 S sulfur 500 20
11 Ar argon 200 6
12 Ca calcium 70 2
13 Ni nickel 60 1
14 Al aluminum 50 2
15 Na sodium 20 1
16 Cr chromium 15 0.4
17 Mn manganese 8 0.2
18 P phosphorus 7 0.3
19 Co cobalt 3 0.06
20 K potassium 3 0.1
everything else 6 0.2
Top 20 elements in the universe Source: WebElements

how like a god

Rutherford was the first to transform one element into another.

147N + 42He → 178O → 11H

technetium

promethium

transuranic, cisuranic, superheavy

element year location process
43 Tc technetium 1936 Palermo
61 Pm promethium 1944 ORNL
93 Np neptunium 1940 LBL
94 Pu plutonium 1940 LBL
95 Am americium 1944 Chicago
96 Cm curium 1944 Chicago
97 Bk berkelium 1949 LBL
98 Cf californium 1950 LBL
99 Es einsteinium 1952 Pacific Ocean found in radioactive fallout
100 Fm fermium 1952 Pacific Ocean found in radioactive fallout
101 Md mendelevium 1955 LBL
102 No nobelium 1958 LBL
103 Lw lawrencium 1961 LBL
104 Rf rutherfordium 1964 JINR
105 Db dubnium 1970 LBL
106 Sg seaborgium 1974 LBL
107 Bh bohrium 1976 JINR
108 Hs hassium 1983 GSI
109 Mt meitnerium 1982 GSI
110 Ds darmstadtium 1994 GSI
111 Rg roentgenium 1994 GSI
112 Cp copernicium 1996 GSI
113 [Uut] [ununtrium] 2003 JINR
114 [Uuq] [ununquadium] 1999 JINR
115 [Uup] [ununpentium] 2003 JINR
116 [Uuh] [ununhexium] 2000 JINR
117 [Uus] [ununseptium] 2010 JINR 4820Ca + 24997Bk → 293117Uus + 410
118 [Uuo] [ununoctium] 2002 JINR 4820Ca + 24998Cf → 294118Uuo + 310n
119 [Uue] [ununennium] not yet synthesized
120 [Ubn] [unbinilium] not yet synthesized
121 [Ubu] [unbiunium] not yet synthesized
122 [Ubb] [unbibium] not yet synthesized
First synthesis of various artificial elements
Note: Some claims are subject to debate.
Chicago: University of Chicago; Chicago, Illinois
GSI: Society for Heavy Ion Research; Darmstadt, Germany
(Gesellschaft für Schwerionenforschung)
JINR: Joint Institute for Nuclear Research; Dubna, Russia
(Объединенный Институт Ядерных Исследований)
LBL: Lawrence Berkeley National Laboratory; Berkeley, California
ORNL: Oak Ridge National Laboratory; Oak Ridge, Tennessee
Palermo: University of Palermo; Palermo, Italy
(Università degli Studi di Palermo)