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Copper (II) and Oxygen. The prefix "di" in dioxide tells me there's the number 2. Here's the chart...
mono=1
di=2
tri=3
tetra=4
penta=5
hexa=6
hepta=7
octa=8
nona=9
deca=10
Oxide is simply a single oxygen, but since it's dioxide, I know there are 2 oxygens. Since each oxygen has a negative 1 charge, and there's 2 oxygens, I know I need to use copper (II) to balance out the net cahrge. Looking at a Periodic Table, you can see copper can be used as copper (I) or copper (II). Thus, copper dioxide is written as...
CuO2
Notice that the amount of oxygens needed is identified as a subscript 2.
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∙ 13y ago
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