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
2 - alkaline earth metals
2 - alkaline earth metals
18 - noble gases
18 - noble gases
17 - halogens
17 - halogens
1 - alkali metals
1 - alkali metals
17 - halogens
The description matches elements of the halogen group, which are found in Group 17 of the periodic table. These elements have seven electrons in their outer shell and tend to be highly reactive and can form salts when they react with metals. They include fluorine, chlorine, bromine, iodine, and astatine. Since it's mentioned that the element is a gas at room temperature and fairly toxic, it most likely refers to either fluorine or chlorine, both of which are gases at room temperature and are quite reactive and toxic.