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The lightest naturally occurring actinide on Earth is thorium, which has the atomic number 90. It is a naturally occurring radioactive element found in small amounts in soil and rocks.

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Which element is the heaviest actininde that occurs naturally on earth?

Uranium is the heaviest naturally occurring actinide.


What is the heaviest actinide that occurs naturally on Earth?

Uranium


What actinide element is the heaviest that occurs naturally on earth?

Uranium because uranium has the highest atomic number, 92, of the natural, actinide elements. Elements higher than 92 are man-made elements. Check the periodic tables to see for yourself!~


Which actinide element is the heaviest that occurs natturally on earth?

URANIUM (:


What element is the heaviest actinide that occurs natrually on earth?

Uranium


What is the lightest element that can undergo radioactive decay and what type of decay occurs in that element?

The lightest "element" that can undergo radioactive decay is the isotope hydrogen-3, which undergoes beta decay. The lightest element with no radioactively stable isotopes is technetium, and its isotopes have different modes of decay.


Are most of the actinides synthetic elements?

Yes, most actinides are synthetic elements, meaning they are not naturally found on Earth and need to be created in a laboratory through nuclear reactions. The only exception is uranium, which is the only actinide that occurs naturally in significant quantities on Earth.


Where does the element neon naturally occurs?

In the atmosphere.


What is the smallest part of a element that occurs naturally?

atom is the smallest part of element


What is the smallest part of an element that occurs naturally?

The smallest part of an element that occurs naturally is an atom. Atoms are the basic units of matter and contain protons, neutrons, and electrons.


Is bromine synthetic?

No, Bromine is not a synthetic element, it occurs naturally


What element is a poisonous gas and occurs naturally in the soil?

Radon