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Since potassium is near the left side of the Periodic Table, you can tell that it likes to give up electrons. (The far left column, like potassium and sodium like to give up one electron). This is because of their valence electrons (atoms like to have zero or eight). They have 1, so they give that one up to have zero. Thats why a potassium ion is K+ (normally). And in compounds, it goes with things that take electrons. (like chlorine, which takes one electron, so you get KCl, one of each element go together to form it)

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Will calcium and potassium form an ionic compound?

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