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In the second half of the century, thorium was replaced in many uses due to concerns about its radioactivity.

Thorium is still being used as an alloying element in TIG welding electrodes but is slowly being replaced in the field with different compositions.

This was first realised in 1995, when it was pointed out that a hypothetical metallic state of thorium that had the [Rn]6d configuration with the 5f orbitals above the Fermi level should be hexagonal close packed like the group 4 elements titanium, zirconium, and hafnium, and not face-centred cubic as it actually is.

Thorium has a characteristic terrestrial isotopic composition, with atomic weight 232.0377(4).

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