Atomic Structure and the Periodic Table: Group 7
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How many electrons are on the outer shell of group 7 elements?
7
In what form group 7 elements tend to be in?
diatomic molecules - they are in pairs eg Cl2, I2
What do fluorine, chloride, bromine and iodine all have in common.
They can all form toxic/poisonous gases.
How does the melting and boiling point of group 7 elements change as you go down the group on the periodic table?
Their melting and boiling points increase as you go down group 7
How does the reactivity of group 7 elements change as you go down group 7?
Their reactivity decreases as you go down group 7
Describe 4 group 7 elements and their states of matter.
• fluorine - pale yellow gas • chlorine - pale green gas • bromine - dark brown liquid • iodine - grey solid, can form poisonous purple vapour
What will happen when chlorine reacts with sodium bromide? Describe the colour change.
Cl2 + 2NaBr → Br2 + 2NaCl The orange colour of Br2 would appear.
What will happen when chlorine reacts with sodium iodide?
Cl2 + 2NaI → I2 + 2NaCl The brown colour of I2 would appear
What will happen when bromine reacts with sodium iodide? Describe the colour change.
Br2 + 2NaI → I2 + 2NaBr A brown colour of I2 would appear
Why does the reactivity of halogens decrease as you go down group 7?
• the atoms get larger • so an extra electron will be attracted to the nucleus of the atom more weakly
Why does the melting and boiling point of group 7 elements increase as you go down the group?
They are larger molecules as you go down the group