Christmas Reactivity

5. A very unreactive, precious yellow metal often used for wedding rings. (4)
9. This common laboratory acid (HCl) produces chloride salts when it reacts with metals. (12)
10. The ______ Series is a list of metals ordered by how vigorously they react. (10)
13. An alloy of iron with carbon, widely used in construction for its strength. (5)
15. A type of reaction where a more reactive metal pushes a less reactive metal out of its compound. (12)
16. The process where a metal is gradually destroyed by reacting with substances in the environment. (9)
17. The specific name for the corrosion of iron when it reacts with oxygen and water. (7)
18. A common decoration placed at the very top of a Christmas tree (Festive Clue!). (4)
19. Elements that are typically shiny, good conductors, and malleable are classified as ______. (6)

1. The flammable gas produced when a reactive metal is placed in acid. (8)
2. A soft, highly reactive Group 1 metal that must be stored under oil; it burns with a yellow flame. (6)
3. A reddish-brown metal that is an excellent conductor of electricity, used in wiring. (6)
4. A low-density metal used for making aircraft bodies and drinks cans. (9)
6. The annual Christian festival celebrating the birth of Jesus, held on 25 December (Festive Clue!). (9)
7. A sweet, often peppermint-flavoured treat shaped like a shepherd's crook (Festive Clue!). (5, 4)
8. To obtain a metal from its ore, often by heating with carbon, is to ______ it. (7)
11. Rocks found in the Earth's crust that contain enough metal to be worth mining. (4)
12. A mixture of two or more elements, where at least one is a metal (e.g., brass or bronze). (5)
14. One of the most reactive metals near the top of the series, its symbol is K. (9)