Which actinoid elements can form compounds in the +4 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. — actinoid element Modern version of the periodic table of the elements (printable).

The actinoid elements that can form compounds in the +4 oxidation state are thorium, protactinium, uranium, neptunium, plutonium, americium, curium, berkelium, and californium.1

For these elements, crystallized compounds in the +4 state have been identified, and many of their oxides and complex fluorides are well-known. While these elements share similarities in this oxidation state, the ease with which they form certain compounds, such as tetrachlorides, bromides, and iodides, generally decreases as the atomic number increases.1