Why are hydrogen, helium and lithium important and how did these elements come to be on Earth?
Answers
FORMATION OF ELEMENTS.
The lightest elements (hydrogen, helium, deuterium, lithium) were produced in the Big Bang nucleosynthesis. According to the Big Bang theory, the temperatures in the early universe were so high that fusion reactions could take place. This resulted in the formation of light elements: hydrogen, deuterium, helium (two isotopes), lithium and trace amounts of beryllium.
Nuclear fusion in stars converts hydrogen into helium in all stars. In stars less massive than the Sun, this is the only reaction that takes place. In stars more massive than the Sun (but less massive than about 8 solar masses), further reactions that convert helium.
why are they important::::
Our own sun, as well as trillions of other stars in the universe, fuses hydrogen into helium to produce energy. Its energy is known on Earth as light and heat. However, when the sun runs out of hydrogen, it moves on to use heavier elements, each occasion of fusion resulting in a new element every time.
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