GROUP 7 - created from Mind Map

Seite 1

halogens

physical properties

chemical properties

change in reactivity of element going down the group

trends in physical properties

trend in chemical properties

reaction between iron wool and halognen

chemical equation

physical state at room temperature( gas to liquid to gas)

poisonous

form diatomic molecule( 2 atom)

form coloured gases

low melting and boiling point(increase going down the group)

density increase as the mass increase

different colour at room temperature

bromine (reddish brown)

iodine (purplish black)

chlorine (greenish yellow)

7 electrons in the outer shell

receive 1 electron and form -1 ion charge

reactivity decrease due to the increasing in atomic size

distance between valence electron and nucleus is further

nuclear attraction force towards the valence electrons become weaker

one of the most reactive elements in PTE

react with metal to form compound called hallides

3) reaction between halogen and water produce acidic solution

2) reaction between halogens and sodium hydroxide solution produce sodium halide,sodium halade and water

1) reaction between halogen and iron produce brown solid of iron(III) hallide