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The halogens are in group 7

The halogens are in group 7. 1. Fluorine gas *pale yellow. 3. Dark brown liquid and vapour. 2. Chlorine gas * yellow/ green. Added to toothpaste to strengthen teeth and bones. The halogens are in group 7. 1. Fluorine gas *pale yellow. 2. Chlorine gas

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The halogens are in group 7

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  1. The halogens are in group 7 1. Fluorine gas *pale yellow 3. Dark brown liquid and vapour 2. Chlorine gas * yellow/ green Added to toothpaste to strengthen teeth and bones

  2. The halogens are in group 7 1. Fluorine gas *pale yellow 2. Chlorine gas * yellow/ green 3. Dark brown liquid and vapour * Explodes with hydrogen forming HCl which dissolves in water to make hydrochloric acid *used for making PVC , *preparing circuit boards * killing germs

  3. The halogens are in group 7 3. Bromine Dark brown liquid and vapour Silver bromide is used in photography

  4. The halogens are in group 7 4. Iodine * dark purple crystals * starch tester and mild disinfectant

  5. HIGHER TIER eg Na+ , K+

  6. HIGHER TIER

  7. HIGHER TIER

  8. HIGHER TIER

  9. Helium Neon Argon Krypton Xenon Radon

  10. The electron is negatively charged - + The proton is positively charged + + Ions An ion is formed when an atom gains or loses electrons and becomes charged: If we “take away” the electron we’re left with just a positive charge: This is called an ion (in this case, a positive hydrogen ion)

  11. Cl Na + - Cl Na A salt crystal of sodium chloride is formed An atom of Chlorine 2.8.7. An atom of Sodium 2.8.1. Diagrams show outermost shell of electrons only Outermost shell gains one electron Outermost shell loses one electron An ion of Sodium An ion of Chlorine 2.8 2.8.8

  12. Cl Na + - Cl Na A salt crystal of sodium chloride is formed The attractive force between a positive and negative ion forms a special bond called an “ionic Bond” This is why salt crystals have a very high melting point! An ion of Sodium 2.8 An ion of Chlorine 2.8.8

  13. l m o a o e s l i c n f b

  14. 2,6 O - - K 2,8,8 + 2,8,7 2,8 - Ca 2,8,8 - - Ca ++

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