Which choice best states the main idea of the text?

Source Texts

Text

Synthetic elements with very heavy nuclei, such as darmstadtium (Ds) and flerovium (Fl), can exhibit behaviors that make these elements challenging to classify. The earliest experiment with Fl revealed properties associated with noble gases, while a second experiment found that Fl acts like a volatile metal. When Yakushev, Lens, et al. studied interactions between Fl and gold surfaces, they found that Fl is less reactive than the volatile metal mercury but is more reactive than the noble gas radon. These results confirm that Fl forms chemical bonds with gold, but the mechanisms of these reactions are unclear.

Observed inconsistencies in the behavior of Fl across experiments can be attributed to its interactions with other elements with very heavy nuclei.

Although experiments have indicated that Fl is similar to the noble gases, it is too reactive to belong to this class of elements.

Experiments have shown that properties of Fl do not precisely align with existing classifications of elements.

Although Fl forms chemical bonds with gold surfaces in experiments, it does not react with volatile metals or noble gases.