The most common elements of Group 7 are chlorine, bromine and iodine. They are diatomic molecules (molecules containing two atoms which are covalently bonded by pair of electrons) They cannot occur as single atoms
They can be solid, liquid, or gas at room temperature depending on the strength of the forces holding the molecules together.
Giant molecules- covalent strucures-
Giant covalent structures may have many atoms joined to each other covalently throughtout the whole molecule. This makes the properties veery different from those of simple covalently bonded molecules
Diamond is a giant, rigid, covalent structure (lattice) where each carbon atom forms four covalent bonds with other carbon atoms.The large number of covalent bonds results in high melting/boiling points.
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