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What is the difference between the two? I heard that a monatomic ion is only one atom but how could this be called an ion if it is only atom that has not shared electrons?

Hi I was just wondering what types of energy are there in space and if there is any way that we could harness these for use here on Earth? I read that there are electromagnetic waves in outer space and these could provide us with huge amounts of power here on Earth. Sorry if any of this dosn't make sense this is my first time on this site.