A 25.2 g sample of thorium was discovered in norway in 1882 and named after the scandinavian god thor. the most sustainable isotopes of thorium has a half life of 14.05 billion years. thorium, along with all other elements, was formed when our milky way universe versus expanded. using the article and what you know about half-life's, compare the amount of thorium that is left today from the original sample that was first formed?
