How do you say halogen in Russian?
— Галогены

Specialized synonyms for halogen in Russian
astatineастат (m) (astát); астатин (m) (astatín)
atв#Russian'в (v), на (na), при (pri), у#Russian'у (u), возле (vózle)
bromineбром (m) (brom)
chlorineхлор (m) (xlor)
fluorineфтор (m) (ftor)
iodineйод (m) (jod)