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Why is flerovium predicted to have a stable +2 oxidation state?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — carbon group element Modern version of the periodic table of the elements (printable).

Flerovium is predicted to have a stable +2 oxidation state due to the periodic trends observed within the carbon group. As the atomic number increases within this group, elements exhibit a distinct tendency to shift from a +4, or tetrapositive, oxidation state toward a +2, or dipositive, state.1

This trend is well-documented in the group's lighter members: while carbon and silicon are very stable in the +4 state, germanium shows a mix of states, and tin displays roughly equal stability between the two. By the time the group reaches lead, the +2 state becomes dominant, with only weak +4 properties.1

By extrapolating these chemical properties and thermodynamic data to the seventh row of the periodic table, scientists predict that flerovium will follow this pattern, with the +2 state being its most stable oxidation state. This prediction is further supported by valence bond theory.1