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|WaterThis is a water molecule. Even though you find complex names on other molecules, everyone calls H2O "water". Water is made up of two hydrogen (H) atoms and one oxygen (O) atom. The formula for water is H2O. The hydrogen atoms have filled orbitals with two electrons and the oxygen atom is filled with eight electrons.|
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|Lithium OxideTwo lithium (Li) atoms can bond with one oxygen (O) atom, making the formula Li2O. Oxygen likes to have two additional electrons to make it happy. Each lithium atom provides one. You can see that the Oxygen atom has eight electrons (6 of its own, and one from each lithium), and the two lithium atoms have two electrons each.|
|Hydrogen PeroxideTwo hydrogen (H) atoms can also bond with two oxygen (O) atoms, making the formula H2O2. That"s just one more oxygen than water, but it is a totally different compound. You can see that each of the Oxygen atoms has eight electrons, and the two Hydrogens have two electrons each. See how the electrons are shared?|
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