Which statement about the properties of elements in Group I or in Group VII is correct?
Bromine displaces iodine from an aqueous solution of potassium iodide.
2 )
Chlorine, bromine and iodine are diatomic gases at room temperature.
3 )
Lithium, sodium and potassium are soft non-metals.
4 )
Lithium, sodium and potassium have an increasing number of electrons in their outer shells.
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