Group 7 - Halogens

Question 1

Colour of element + physical state at room temp : Fluorine

Answer 1

Yellow, gas

Question 2

Colour of element + physical state at room temp : Chlorine

Answer 2

Green, gas

Question 3

Colour of element + physical state at room temp : Bromine

Answer 3

Dark red, liquid

Question 4

Colour of element + physical state at room temp : Iodine

Answer 4

Purple/black, solid

Question 5

Displacement reaction between a halogen and the aqueous salt of another halogen

Answer 5

A more reactive halogen can displace of a less reactive halogen in an ionic halide compound

Question 6

Pattern in reactivity of group 7 elements in terms of electronic configurations

Answer 6

Halogens react by gaining 1 e⁻ to form X⁻ ion. Down group 7, the halogens become less reactive, the atomic radius and shielding increases so the incoming e⁻ is further from the nucleus and attracted less strongly

Question 7

Test for chlorine gas

Answer 7

Bleaches damp blue litmus paper