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?

Answer 1

The element you are describing belongs to the group of halogens on the periodic table. Halogens are in Group 17 (or Group VIIA) and typically have seven electrons in their outer shell. They are known to be highly reactive and include elements that are gases at room temperature, such as fluorine (F) and chlorine (Cl). Additionally, many halogens are considered toxic.