Astatine-211 is the isotope with the second longest known half life, and has high potential in being a canidate for chemotherapy, focused on a variety of small cluster forms.
Unlike At-210, which is much much more stable, At-211 has zero chance of decaying into Polonium-210, which is highly toxic due to its long half life and extreme radioactivity (and would therefore cause more cancer!), and instead decays into Po-211, which decays into Lead-207 within mere seconds. Along with this, it is highly likely to decay into Bismuth-207, which isn't as dangerous as Po-210 despite its beta decay and half a lifetime half-life.
in AUBREY'S CATTOS, At-211 is a less timid form of their siblings, due to their focus in medicine. instead, they are just adverse to company, prefering solitude but not forcing it. They are also much more approachable and bubbly, at least to a degree.
