Group 7

<<The halogens<<

• <<The halogens are diatomic molecules consisting of a single covalent bond<<
• <<low mp and bp<<
• <<mostly found in the-1 oxidation state<<
• <<Mp and Bp increases down the group because the atoms have more electrons so the London forces between molecules are stronger<<

]]Oxidising and reducing ability]]

• ]]Oxidising power of the halogens decreases down the group because atomic radius increases, electron shielding increases and the ability to gain an electron in the p sub shell and form 1- ions decreases]]
• ]]Reducing power of the halides increases down the group because the number of shells increases, there is more shielding, and the electrons become less strongly attracted]]

}}Displacement reactions}}

}}A halogen will displace a halide from the solution if the halide is below it on the periodic table.}}

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