←Te   Br↑   ↓At   Xe→

Iod ∙ iode ∙ iodio ∙ yodo
group ‘h+h’ / hydrogen and halogens: RH

• melting point: 113.5°C
• boiling point: 184.35°C @ 35 atmos.
• density: 4.93 g/cm³

☢ radioisotopes:
I-131 (T1/2=8 d) fission product , medical
I-129 (T1/2=16 Ma) fission product