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Chemistry element what is a compound?
Elements can combine to form compounds. Compounds are substances that contain two or more elements in a fixed ratio. Compounds are table salt and water.
Chemistry element How many essential elements.
There are 25 essential elements to life. Four elements make up majority of most cells. Oxygen, carbon, hydrogen, and nitrogen.
What are the four main elements?
Atomic structure what is atomic # vs. Mass?
Atomic number determines which element it is of protons.
Mass is a measure of material in an object.
The atoms mass number sum the number of protons and neutrons in its nucleus.
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