can you name a few isotopes of the chemical element?
Helium-3, Helium-4
Helium
There are nine known isotopes of helium, but only helium-3 and helium-4 are stable.
where does the world's helium come from Most helium in the universe is helium-4, the vast majority of which was formed during the Big Bang what is helium? It  is a chemical element with the symbol He and atomic number 2 who was the first to discover this element? It was first detected  by Georges Rayet, Captain C. T. Haig, Norman R. Pogson, and Lieutenant John Herschel, and was subsequently confirmed by French astronomer, Jules Janssen where is this first person from? Georges-Antoine-Pons Rayet was a French astronomer is there anything else that he has discovered apart from the element? Yes, he discovered Wolf–Rayet stars together with Charles Wolf where can this chemical element be extracted from? Natural gas can you tell me some domestic uses of this type of gas? Natural gas can be useful in domestic cooking and heating fuel does this gas put people at any risk? Yes, explosions caused by natural gas leaks can occur also it produce  carbon monoxide which is harmful
wiki:7772669
Helium [SEP] Isotopes
There are nine known isotopes of helium, but only helium-3 and helium-4 are stable. In the Earth's atmosphere, one atom is for every million that are . Unlike most elements, helium's isotopic abundance varies greatly by origin, due to the different formation processes. The most common isotope, helium-4, is produced on Earth by alpha decay of heavier radioactive elements; the alpha particles that emerge are fully ionized helium-4 nuclei. Helium-4 is an unusually stable nucleus because its nucleons are arranged into complete shells. It was also formed in enormous quantities during Big Bang nucleosynthesis. Helium-3 is present on Earth only in trace amounts.