The Group 7 elements are also known as the halogens. The three common Group 7 elements are chlorine, bromine and iodine. The word ‘halogen’ means 'salt former'.
Where in the periodic table are the halogens found?
On the far left
In the middle
Near the right-hand side
What does bromine look like?
A green gas
A brown liquid
A grey solid
What happens to the melting points and boiling points as you go down Group 7?
They stay roughly the same
What is the physical state of iodine at room temperature?
What is the formula of chlorine gas?
What is the trend in reactivtity of Group 7 elements?
Reactivity increases down Group 7
Reactivity decrease down Group 7
Reactivity stays the same down Group 7
Which halogen will displace bromine from a solution of potassium bromide?
The equation below shows how chlorine can displace bromine from solutions of sodium bromide:
2Cl2 + 2Na+Br– → Br2 + 2Na+Cl–
What is oxidised in this reaction?
In a displacement reaction, iodide ions lose electrons to form iodine. What name is given to this process? [Higher tier only]
A Group 1 metal is ignited and placed in a container containing a toxic green-yellow gas. The reaction produces a yellow-orange flame. What is the correct equation for this reaction?
Na + Cl → NaCl
Na + Cl2 → NaCl2
2Na + Cl2 → 2NaCl