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These were the last major group of elements to be discovered. They are all unreactive and scientists tended to discover new elements through the reactions that they observed. You will see on early periodic tables that group 0 is often missing
The elements in Group 0 of the periodic table are called the noble gases. They are unreactive and do not easily form molecules because their atoms have stable arrangements of electrons.
The noble gases have eight electrons in their outer shell, except for helium, which has only two electrons.
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