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
1 - alkali metals
1 - alkali metals
18 - noble gases
18 - noble gases
2 - alkaline earth metals
2 - alkaline earth metals
17 - halogens
1 answer
The element described has seven electrons in its outer shell, which indicates that it is likely to belong to Group 17 of the periodic table, known as the halogens. Halogens are known to be toxic gases (like chlorine and fluorine), highly reactive, and they have seven valence electrons. Therefore, the correct answer is:
17 - halogens
