The Group 7 close Group 7 The vertical column of non-metal elements next to group 0 in the periodic table, also called the halogens. elements close element A substance made of one type of atom ...

Excerpted from A Tale of 7 Elements, by Eric Scerri. ... The color is expected to be very dark and most probably black on the basis of the trend among the halogen group, to which astatine belongs.

The elements in group 7 are known as halogens. Fluorine and chlorine are gases. Bromine is one of only two liquid elements. Iodine is solid. They exist as diatomic molecules - they have two atoms ...