1. Which has more atoms—a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13? Explain. 2. Why aren’t the atomic masses listed in the periodic table whole numbers? 3. Which contributes more to...

1. Which has more atoms—a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13? Explain.

2. Why aren’t the atomic masses listed in the periodic table whole numbers?

3. Which contributes more to an atom’s mass—electrons or protons? Which contributes more to an atom’s size?