The correct answer choices for the questions are:
1. (b) proton donor
2. (a) effervescence
3. (c) red
4. (c) Normal
5. (b) soluble
6. (b) precipitation
7. (b) completely
8. (a) 2
9. (c) n=3, l=1, ml=-1
10. (d) 8
11. (c) sub-shells
12. (a) Electrons enter the lowest available energy level
13. (b) 3d
14. (a) 1s²,2s²,2p6,
15. (a) BeCl2
16. (c) Element
17. (b) electrically neutral
18. (a) Proton