2Chemical vs. Nuclear Reactions Chemical reactions involve valence electrons and atoms bonding together.Nuclear Reactions involve the nucleus of atoms.
3What makes an atom stable? Proton to Neutron Ratio is just right.Strong Nuclear Force is what holds the nucleus together
4What is Radioactivity? Atoms with unstable nuclei cause radioactivity. The proton to neutron ratio is not balanced, so the strong force doesn’t hold the nucleus together.The unstable nuclei breaks into smaller (more stable) atoms and release energy.
9Nuclear Decay Reactions Write the parent isotope on the left side of the arrow.Place the emission particle (what is lost) on the right side of the arrow.Place the daughter isotope on the right side of the arrow.
10ExampleUranium-238 decays by emitting an alpha particle to form thorium-234.23892U Th He
11Now you try! Potassium-40 decays to calcium-40 by beta emission. 4019K Ca ß
12Practice Nuclear Reaction Problems Write the equation for the beta emission by Ni-59.Write the equation for the alpha emission by Ra-226.
13Nuclear Fusion Small atoms are brought together to form a larger atom. Process that occurs on the sun…provides a lot of energy.
15Nuclear Medicine Radioactive isotopes are injected or ingested. Detectors “see” the particles and can provide an image that help doctors diagnose problems.Can also be used to treat conditions such as cancer.