The atom is krypton and its symbol is Kr.
the mass number is 41 + 36 = 77
its charge is 0 as it is a noble gas.
It wont melt like gold and copper would at that temperature
18. c
19. A
20. decomposition reaction
21. 4
22. 0.04%
Answer:
I don’t want to download a pdf that I don’t know what it is…
Also, brainly strictly says that we can’t post questions about a test or quiz that is found in school…
Explanation:
Answer: Opaque hope this is helpful
Send a brainliest if this was helpful :)