1) Actinium-226 can decay by any of three different nuclear processes: a emission. B emission, or electron capture. Write a balanced nuclear equation for the decay of actinium-226 by one of these processes.

2) Earth has a mass of 5.98 × 1024 kg and a volume of 1.08 × 1012 km3. What is the average density of our planet in units of grams per cubic centimeter? Report your answer with appropriate significant figures.