strontium-90 has a half life of 29 years. if a site held 4000 kg of this isotope, approximately what mass of strontium-90 would be left after 87 years?

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

Which would freeze at a higher temperature: the great salt lake or lake tahoe? a. lake tahoe would freeze at a higher temperature. b. the great salt lake would freeze at a higher temperature. c. both lakes would freeze at the same temperature.

What lessons does the history and study of the periodic table offer to other fields of science, and the pursuit science more generally