Element:H
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				水素: 宇宙で最も多い元素、地球表面や生体で3番目に多い元素
Atomic Number
1
Atomic Name
Hydrogen(水素)
Stable Isotopes
| isotope | mass | isotopic abundance (%) | 
|---|---|---|
| 1H | 1.0078250319 | 99.9885(70) | 
| 2H(2D) | 2.0141017779 | 0.0115(70) | 
| ※ Note(注釈) | 
Radioisotopes
| isotope | half life | disintegration form | 
|---|---|---|
| 3H | 12.33 years | beta- | 
| ※ For mark |