2.8C: Explain the Trend in Reactivity in Group 7 in Terms of Electronic Configurations

HALOGENS: Group 7 Non-Metals that are poisonous and commonly includes Chlorine, Bromine and Iodine

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ELECTRONIC CONFIGURATION OF ELEMENTS IN GROUP 7:

TREND IN REACTIVITY OF GROUP 7:
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• Reactivity of Group 7 Non-Metals increases as you go up the Group
• As each Element has seven Electrons on their outer shell, they will react to gain one outer Electron to form full outer shell of electrons
• As you go up Group 7, the number of shells of Electrons decreases (period number decreases up the periodic table), hence there are stronger electrostatic forces of attraction to attract the extra Electron needed as outer Electrons are closer to the Nucleus
• As Electrons can be attracted more readily, the reactivity of Group 7 Non-Metals increases as you go up the Group