The element you are describing belongs to Group 17 of the periodic table, which are the halogens. Halogens have seven electrons in their outer shell, are typically toxic, and many of them are gases at room temperature (for example, fluorine and chlorine). They are also highly reactive.
A scientist studies an element that has seven electrons in its outer shell is fairly toxic is a gas at room temperature and is highly reactive to which group of the periodic table does this element belong 18 noble gases to alkaline earth metals 17 halogens one alkali metals
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