5 which element is the lightest and at the same time

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_____ 5. Which element is the lightest and at the same time the most abundant in outer space? a. hydrogen b. helium c. lithium d. iron
_____ 6. How do heavier elements formed?
_____ 7. Which element can be formed when three atoms of helium are fused? 1 | EARTH and LIFE SCIENCE
_____ 8. Which of the following elements DOES NOT belong to the group?
_____ 10. How Elements heavier than iron are formed? a. big bang nucleosynthesis c. stellar nucleosynthesis b. solar nucleosynthesis d. supernova nucleosynthesis
_____ 11. Which element will be formed when Carbon atom is combined with Helium atom?
_____ 12. Why do average stars have longer life span than massive star?
_____ 13. Which phase of star life cycle is our sun?
_____ 14. Which of the following contains only heavy elements? a. carbon, lithium, neon c. carbon, beryllium, helium b. carbon, silicon, magnesium d. helium, carbon, hydrogen
_____ 15. In which stage do massive stars explode and release large amount of energy?
Lecturette Lesson 1 Stellar Nucleosynthesis: Rise of the Stars! The world where we live today is just a small part of our universe. In your previous years, you have learned about the different theories of the origin of the universe that eventually led to the formation of galaxies, solar system and other heavenly bodies. This lesson will focus on one of those wonderful things present in outer space, the stars. Although stars are millions of light years away from us, we can still see them twinkling in the night sky. Let’s find out how they emit light and what keeps them shining for a long time. Scientists believe that the formation of the universe began through the explosion of a primordial atom which happened 13 billion years ago. It is known as the Big Bang. It became a theory that also explains the continuous expansion of the universe. 2 | EARTH and LIFE SCIENCE
Right after Big Bang, protons and neutrons combined together and formed light elements Hydrogen and Helium in the process of Big Bang Nucleosynthesis. Other light elements such as Lithium and Beryllium were also formed during this process. Stellar Nucleosynthesis The word “stellar” means star and the formation of elements in the center of the star is called stellar nucleosynthesis. Carl Sagan said that “We are made of star stuff.” What did he mean by that? If we know how some important heavy elements were formed same as stars, that maybe a clue.

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