4.2 Group 7
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What are the properties of group 7 elements?
diatomic darker in colour down group mp / bp increases down group
What are the group 7 elements?
F2 Cl2 Br2 I2 At2
What is the formula for Fluorine?
Fl2
What is the formula for Chlorine?
Cl2
What is the formula for Bromine?
Br2
What is the formula for Iodine?
I2
What is the formula for Astatine?
At2
What is the colour of Fluorine?
pale yellow
What is the colour of Bromine?
brown
What is the colour of Chlorine?
pale green
What is the colour of Iodine?
dark grey
What is the colour of Astatine?
black
What state is Fluorine?
gas
What state is Chlorine?
gas
What state is Bromine?
liquid
What state is Iodine?
solid
What state is Astatine?
solid
What happens when group 7 elements react with metals?
ionic compound forms outer shell electrons from metal transferred to halogen
How many electrons do group 7 elements have in the outside shell?
7
What happens when the group 7 atom forms an ion?
halogen -> halIDE
Why is group 7 + metal a redox reaction?
metal loses electrons group 7 gains electrons
Why do halogens get less reactive down the group?
need full electron shell atoms further down have more shells further from nucleus attraction to nucleus is weaker
What is the chemical test for chlorine?
damp blue litmus paper turns white
When does halogen displacement occur?
more reactive halogens displace less reactive halogens