'Astatine is the only halogen whose isotopes are all this, which is why they have half-lives'
radioactive
HALOGENS: Astatine is the only halogen whose isotopes are all this, which is why they have half-lives
Astatine is the only halogen whose isotopes are all this, which is why they have half-lives
Astatine is the only halogen whose isotopes are all this, which is why they have half-lives
HALOGENS
radioactive
HALOGENS