Rust on a nail is a chemical change.
Ice melting IS a physical change. Ice is made of water, when you melt ice its still water. Just in a different physical state.
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Positively charged ions are called cations; negatively charged ions, anions
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We can see that the atomic radius decreases across every row.
Explanation:
I will comment more below.
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B because there is 2 gases in the air that we know of because of the text