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  • A element is a species of atoms having the same number of protons in their atomic nuclei.
  • Today, we're going to talk about elements. What do you know about elements so far?
  • Oxygen? It that we're now breathing in?
  • Teacher, what is oxygen in chemistry?
  • Let's walk around the school to talk to elements and learn more about them.
  • Today. we'll learn about hydrogen, carbon and oxygen.
  • Who are you?
  • Hi! I'm oxygen. I have a symbol "O" and atomic number 8. At standard temperature and pressure , two atoms of the element bind to form dioxygen , a colorless and odorless diatomic gas with the formula O2 . I am an important part of the atmosphere and diatomic oxygen gas constitutes 20.8% of the Earth's atmosphere. All most all the living things, including you, need me.
  • Hi, I'm hydrogen. I have a symbol "H" and atomic number 1. At standard temperature and pressure , I am a colorless , odorless , tasteless , non-toxic, nonmetallic , highly combustible diatomic gas with the molecular formula H2 . My monatomic form (H) is the most abundant chemical substance in the Universe , constituting roughly 75% of all baryonic mass. Industrial production is mainly from steam reforming natural gas, and less often from more energy-intensive methods such as the electrolysis of water .
  • Then, who are the number 1 next to you, oxygen?
  • This is my friend, hydrogen. Two of him and one of me can form water!
  • I come to hall now! Er.. Who are you?
  • Hello, I'm carbon. My symbol is"C" and my atomic number is 6. The atoms of me can be bonded together in different ways, termed allotropes of carbon. The best known of mine are graphite , diamond , and amorphous carbon. I forms a vast number of compounds , more than any other element, with almost ten million compounds described to date, and yet that number is but a fraction of the number of theoretically possible compounds under standard conditions.
  • I hope you guys learn more about those three elements now.
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