Big 7 Chapter 6 Nuclear Reactions Focus Assignment

Big 7 - Chapter 6 Nuclear Reactions

Focus Assignment: Open to page 333. Copy the table of half-lives into your notebook

Nuclear Weapons: A Visual Timeline http: //www. youtube. com/watch? v=g. Je 7 f. Y-yowk

Big 7 - Chapter 6. 1 – Nuclear Radiation and Decay 1. Radioactive Decay 2. Nuclear Radiation 3. Alpha Decay 4. Beta Decay 5. Gamma Decay 6. Neutrons 7. Half Life

1. Radioactive Decay Disintegration of an unstable atomic nucleus into one or more different nuclides or element.

2. Nuclear Radiation KEY = proton = neutron = electron Particles that are released from the nucleus during radioactive decay.

3. Alpha Decay (α) Alpha particle (two protons and two neutrons) ejected during KEY nuclear decay resulting in = proton = neutron different element = electron Atomic mass reduced by 4 Atomic # reduced by 2 226 Ra 88 222 86 Rn + He 4 2

4. Beta Decay (β) KEY = proton = neutron = electron 14 C 6 Beta particle (electron) ejected during nuclear decay resulting in a different element A neutron is changed to a proton 14 7 N 0 + -1 e

5. Gamma Decay (γ) Gamma ray (high energy electromagnetic radiation) is KEY = proton emitted lowering the energy = neutron content of the nucleus – does = electron not change element Gamma Rays can cause damage in matter, they penetrate up to 60 cm of aluminum or 7 cm of lead

6. Neutron Emission KEY = proton = neutron = electron Neutrons are emitted from unstable nuclei We will see that this is a requirement for a nuclear reaction

7. Half Life The amount of time it takes for radioactive substance to decrease to half of its value.

Half Life Formula % remaining = 1 n 2. . n = number of half lives