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How can an atom that has seven valence electrons complete its outermost level

User Nan Hua
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It can form a covalent bond with a hydrogen bond that has one valence electron to have eight valence electrons and become stable.
User Stinepike
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Answer: The element needs to react with other element by gaining an electron to complete its valence electron.

Explanation: The element which exhibit 7 valence electrons are halogens. They readily react with other element, for example: Hydrogen and Sodium, in order to gain an electron to complete their outermost shell.

User Babtek
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