Learning Objective Describe the properties of group seven elements

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Presentation transcript:

Learning Objective Describe the properties of group seven elements To be able to: Describe the properties of group seven elements Key Words: Element, Compound, Formula

How does reactivity change as you go down group one? Wednesday, 22 May 2019 Compounds and Formula Date and title in books. You need a pen, pencil & ruler. Starter Activity – 2 minutes How does reactivity change as you go down group one?

(F) Target 9-1 State the name and chemical symbols for the group seven elements (F/H) Target 4-9 Describe how the properties of the halogens changes down the group (H) Target 5-9 Write word and balanced symbol equations for the reactions of group seven elements Extension: Application of Knowledge Target 8/9 Use the position of elements within the periodic table to predict the result of chemical reactions Learning Outcomes

Fluorine – F2 Fluorine is a highly toxic yellow gas. It melts at -220ºC, and boils at -118ºC

Chlorine - Cl2 Chlorine is a yellow- green gas. It is toxic at higher concentrations It melts at -101ºC, and boils at -35ºC

Bromine - Br2 Bromine is a red- brown liquid. It is toxic and corrosive. It fumes at room temperature It melts at -7.2ºC, and boils at 58.8ºC

Iodine - I2 Iodine is a black solid at room temperature; which becomes a deep purple gas when heated. It melts at 114ºC, and boils at 184ºC

Reactivity decreases down the group. This is because the outer-shell gets further away from the nucleus; and so the attraction between the nucleus and incoming electrons decreases.