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Element #43 - technetium

Element #61 - promethium

Element #95 - americium

Element #96 - curium

Anything beyond curium

Elements #93, neptunium, and #94 plutonium, are only found naturally in very tiny amounts in uranium ore, such as might be produced by unusual nuclear reactions.

Also, some traces of plutonium-244 might be left over from before the creation of the Earth.

The least common element that is lighter than uranium but is found naturally (from radioactive decay) is astatine, element #85. It is extremely radioactive.

Astatine is much rarer than polonium (84), radon (86), francium (87), radium (88),

actinium (89), or protactinium (91).

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