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The octet rule is a chemical principle that states that most non-metal elements need to have eight electrons in their outermost shell to achieve stability. These elements will gain, lose, or share electrons in order to achieve the stable configuration of eight electrons in their outermost shell. The octet rule is important in predicting the chemical behavior of elements and the formation of chemical bonds between atoms.
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The duplet rule is a chemical principle that applies to hydrogen, helium, and other elements with only one or two electrons in their outermost shell. These elements can achieve stability by either gaining or losing electrons to have a full outer shell of two electrons, rather than eight. The duplet rule is important in predicting the chemical behavior of these elements and their ability to form chemical bonds with other atoms.
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