helium auf bulgarisch

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Definition helium

Helium
Helium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless[...]
https://en.wikipedia.org/wiki/Helium

Isotopes of helium
there are nine known isotopes of helium (2He) (standard atomic weight: 4.002602(2)), only helium-3 (3 He ) and helium-4 (4 He ) are stable. All radioisotopes[...]
https://en.wikipedia.org/wiki/Isotopes_of_helium

Helium-3
Helium-3 (3He see also helion) is a light, stable isotope of helium with two protons and one neutron (in contrast, the most common isotope, helium-4 has[...]
https://en.wikipedia.org/wiki/Helium-3