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What type of element forms anions?

A:

Quick Answer

Elements that form anions are elements that need to gain electrons to form a complete octet. Elements in the sixth and seventh periods of the periodic table need to gain one or two electrons to have an octet.

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Full Answer

Some common elements that form anions are hydrogen, fluorine, iodine and oxygen. Oxygen needs to gain two electrons so it forms an anion with a charge of negative two. By contrast hydrogen, fluorine and iodine only need to gain one electron so they form an anion with a charge of negative one. Elements in the seventh period often form ionic bonds with metals, meaning that they take the electron from the metal and leave the metal with a positive charge. One example is sodium chloride.

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