From the list of characteristics given below, select the five which are relevant to non-metals and their compounds:
1. Ductile
2. Conduct electricity
3. Brittle
4. Acidic Oxides
5. Basic Oxides
6. Discharged at anode
7. Discharged at cathode
8. Ionic chlorides
9. Covalent chlorides
10. Reaction with dilute sulphuric acid yields hydrogen
11. 1,2 or 3 valence electrons
12. 5,6,7 valence electrons
(Write the five letters corresponding to the correct characteristics).