contestada

Some radioisotopes with the longest half-lives can remain radioactive for ________ of years.
A. billons
B. millions
C. thousands
D. tens of thousands

Respuesta :

PhineasJack
A: billions of years :) 
Tellerium -128's half life is longer than she existence of the universe! 
xenon- 136 has a half life of 10^21 years.

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