Why is Group 7 called halogens?

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Tags

1. #outer
2. #called
3. #found
4. #halogens
5. #former
6. #table
7. #group
8. #giving
9. #their
10. #elements
11. #salts
12. #number
13. #halogen
14. #metallic
15. #means
16. #oxidation
17. #compounds
18. #electrons
19. #shells
20. #periodic
21. #containing