1. What are the atomic number and atomic mass of the element formed when Po emits a beta particle? What are they if the polonium emits an alpha particle? 2. Radium-226 is a common isotope on Earth,...

1. What are the atomic number and atomic mass of the element formed when
Po emits a beta particle? What are they if the polonium emits an alpha particle?

2. Radium-226 is a common isotope on Earth, but it has a half-life of about 1620 years. Given that Earth is some 5 billions years old, why is there any radium at all?

3. Is carbon dating advisable for measuring the age of materials a few years old? How about a few thousand years old? A few million years old?