Part B

• nitrogen N 7 7 7 2 5
• calcium Ca 20 20 20 4 2
• chlorine Cl 17 18 17 3 7
• arsenic As 33 42 33 4 5
• Indium In 49 66 49 5 3
• Magnesium ion 12 12 10 3 2

Part C

1. transition metals
2. odour hardness (many different answers)
3. fill
4. anything that takes up space and has mass
5. heium (any elementfrom column 8)
6. gains or loses an electron
7. iridium
8. 2
9. physical
10. colour change from green thru aorange to brick red with a thick precipitate forming