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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?(1 point)
Responses
18 - noble gases
18 - noble gases
2 - alkaline earth metals
2 - alkaline earth metals
17 - halogens
17 - halogens
1 - alkali metals
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17 - halogens
Explanation: Elements with seven valence electrons are in Group 17. They are highly reactive, often toxic, and several (like chlorine and fluorine) are gases at room temperature.
Explanation: Elements with seven valence electrons are in Group 17. They are highly reactive, often toxic, and several (like chlorine and fluorine) are gases at room temperature.
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