The following table shows the currently accepted half-life values for four parent isotopes.

Parent Isotope Currently Accepted Half-Life Values
Uranium-238 4.5 billion years
Uranium-235 704 million years
Thorium-232 14.0 billion years
Rubidium-87 48.8 billion years
Potassium-40 1.25 billion years
Samarium-147 106 billion years

Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes would contain the least amount of the parent isotope?
Rubidium-87

Thorium-232

Uranium-235

Uranium-238

Question

The following table shows the currently accepted half-life values for four parent isotopes.


Parent Isotope	Currently Accepted Half-Life Values
Uranium-238	4.5 billion years
Uranium-235	704 million years
Thorium-232	14.0 billion years
Rubidium-87	48.8 billion years
Potassium-40	1.25 billion years
Samarium-147	106 billion years

Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes would contain the least amount of the parent isotope?
 Rubidium-87

 Thorium-232

 Uranium-235

 Uranium-238

anonymous · Answer

@kaylaprincess

kaylaprincess · Answer

Uh. I dunno how to explain well enough for this.. ugh
but its Uranium 238

kaylaprincess · Answer

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kaylaprincess · Answer

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