Atoms
Properties
Ground state
Mass energy (MeV)
Rydberg energy (eV)
Lyman-α (nm)
1S-2P transition energy (eV)
Stability
1.02
−6.8
243.0
5.1
Unstable (no nucleus)
938.00
−13.6
121.5
10.2
Stable (nucleus exist)
3756.00
−54.6
58.4
21.2
Stable & inert (nucleus exist)