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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