The half-life of radium-226 is 1620 years. What percentage of a given amount of the radium will remain after 900 years

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.