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Group 7 - Halogens (Properties, 7 outer shell electrons, are all diatomic…
Group 7 - Halogens
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- are all diatomic molecules (come in pairs)
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- the melting point increases
- the boiling point increases
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- change of state (from gas to liquid)
- elements get less reactive
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- Use damp blue litmus paper.
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- Hydrogen + halogen --> hydrogen halide
- Hydrogen halide + water --> acidic solution
- Hydrogen and chlorine molecules collide and covalent bond breaks.
- Covalent bond form between hydrogen + chlorine --> hydrogen chloride
- Hydrogen chloride dissolves in water. It breaks up to H+ and Cl-.
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- form molecules with two atoms joined by a covalent bond
- form covalent compounds when they react with non-metal atoms
- form ionic compounds when they react with metal atoms.
- the negative electron is attracted to the positive charge of the nucleus
- Chlorine gains an electron less easily than fluorine:
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