I have partitioned the chemical elements into two groups based on a certain property that is shared by some of them, but not by the remaining ones.
The following elements have my enigmatic property:
Bismuth, Chlorine, Gold, Helium, Iodine, Mendelevium, Nitrogen, Silver
The following elements do not have my enigmatic property:
Dubnium, Erbium, Nobelium, Terbium, Ytterbium, Yttrium, Zinc, Zirconium
Which of the following elements do have this property?
Aluminium, Fluorine, Francium, Gallium, Lutetium, Neon, Oxygen, Polonium.