What are group one elements? Group one elements are alkali metals. The physical properties of group one elements are that they are shiny and the alkali metals are very soft. Lithium is the hardest alkali metal and they become softer as you go down the group. The chemical properties of group one is that they’re very reactive when mixed with water or when in contact with the air. Each element in group one has one electron in their outermost shell. Also, group one elements get more reactive as you go down; this is due to that the one electron in the outermost shell is further away from the nucleus which makes it more reactive. There are many experiments which allow you to see the reactions take place.
Group 7 elements are halogens. What are
Group 7 elements are halogens. What are