Why are Group 7 elements called halogens?

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Tags

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