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How do metals on the periodic table tend to achieve the octet rule?

Sagot :

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By either gaining or losing an electron. 

So for the halogens (group 17) they have 7 valence electrons so they need one more to have a full outer shell. They will form a bond with another element that can give an electron. Typically a halogen will bond with an alkaline metal because they have 1 valence electron in their outer shells. This sharing of electrons (covalent bond) satisfies both elements, giving them full outer shells. 
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