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)%0D%0AResponses%0D%0A%0D%0A17 - halogens%0D%0A17 - halogens%0D%0A%0D%0A1 - alkali metals%0D%0A1 - alkali metals%0D%0A%0D%0A2 - alkaline earth metals%0D%0A2 - alkaline earth metals%0D%0A%0D%0A18 - noble gases

Answer 1

The element described has seven electrons in its outer shell, is a gas at room temperature, and is highly reactive. This matches the characteristics of the halogens, which are found in Group 17 of the periodic table. Halogens typically have seven valence electrons, are known for their toxicity, and most of them (except for astatine) are gases or diatomic molecules at room temperature.

Therefore, the correct response is:

17 - halogens