Table 1-1
Hydrogen
n = p-1
n = p
n = p+1
H 001
99.985%
Stable
1.0078250
n 001
Helium
H 002
0.015%
Stable
2.0141017
He 003
0.000137%
Stable
3.0160293
H 003
12.33 yr
B-
He-3
3.0160492
He 004
99.999863%
Stable
4.0026032
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