Group VII properties

What the syllabus asks of you

• Describe the Group VII halogens, chlorine, bromine and iodine, as diatomic non-metals with general trends down the group, limited to: (a) increasing density (b) decreasing reactivity
• State the appearance of the halogens at r.t.p. as: (a) chlorine, a pale yellow-green gas (b) bromine, a red-brown liquid (c) iodine, a grey-black solid
• Describe and explain the displacement reactions of halogens with other halide ions
• Predict the properties of other elements in Group VII, given information about the elements