You head forward in time a century or two, and visit Marie and Pierre Curie at the Sorbonne in Paris. They are working with samples of the following five substances: - Hydrogen-1 (whose nucleus is a single proton) - Helium-4 (whose nucleus contains 2 protons and 2 neutrons.) - Carbon-12 (whose nucleus contains 6 protons and 6 neutrons.) - Carbon-14 (whose nucleus contains 6 protons and 8 neutrons.) - Radium-226 (whose nucleus contains 88 protons and 138 neutrons.) Of the substances listed, which one is most likely to undergo alpha decay? Briefly explain your reasoning. Of the substances listed, which one is most likely to undergo beta decay? Briefly explain your reasoning.