Answer: D. Potassium bromide
What invention I want to help you but I am confused
No chemical because, its changeing the stuff
B, they belong to group 1
A: Li is period 2 and Na is period 3
C: Na has one more electron shell
D: Not related to how it is spelled
Answer:
First one: group
Second one: period
Third one: number of valence electrons
Last one: increases