

Day7
Presentation
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Chemistry
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9th - 12th Grade
•
Hard
Shika Naing
FREE Resource
3 Slides • 0 Questions
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Day 7 note
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Introduction
About 50% of the mass of the earth's crust is oxygen.
Large part of plants and animals contain oxygen in combination with carbon, hydrogen and nitrogen.
Roughly 96% of(by mass) of human body is made up of just four elements: oxygen, carbon, hydrogen and nitrogen.
Astatine is a radioactive halogen. Halogens are the most reactive non-metals. They react with most metals to form salt.
Halogen means salt former in Greek.
Day 7 note
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