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physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > thorium
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thorium comparison table
Subject has ocean residence time has occurrence is a kind of has atomic number has group has image has filling orbital has definition has ocean concentration
actinide  inner transition metal89 to 103a column number in the table of the elements 5fElement with atomic number between 89 (Actinium) and 103 
scavenged oceanic element103 years or lessoceanoceanic element     decreasing with depth
thorium50 yearsoceanscavenged oceanic element89 to 103a column number in the table of the elements5f decreasing with depth

Next actinidetransuranium element    Upactinide, scavenged oceanic element    Previous actinideprotactinium