1. Click Play ( ), and then click Pause ( ) when the alpha particle is clearly visible. What is an alpha particle made of? two protons and two neutrons 2. Click Play and observe. Besides the alpha particle, what else is emitted from the nucleus during alpha decay? a gamma ray Gamma rays are energetic electromagnetic waves they are often emitted in nuclear decay. Several types of nuclear decay can be explored with the Nuclear Decay Gizmo. On the Gizmo, check that Alpha decay and Uranium are selected. The decay of radioactive atoms generally results in the emission of particlesand/or energy. A helium atom has 2 protons and 2 neutrons. What is the mass number of this atom? 4 2. The atomic number of an element is equal to the number of protons in each atom of the element. All helium atoms have 2 protons. What is the atomic number of helium? 2 Gizmo Warm-up While most atoms are stable, some are radioactive , which means that they have a tendency to undergo spontaneous nuclear decay. Particle Location Charge Approximate mass Proton Nucleus 1 + 1 u Neutron Nucleus 0 1 u Electron Orbitals 1 – 0 u 1. The mass number of an atom is equal to the sum of protons and neutrons in the nucleus. ![]() The approximate mass of each particle is given in universal mass units (u). Vocabulary: alpha particle, atomic number, beta particle, daughter product, gamma ray, isotope, mass number, nuclear decay, positron, radioactive, subatomic particle Prior Knowledge Questions (Do these BEFORE using the Gizmo.) The chart below gives the locations, charges, and approximate masses of three subatomic particles. Name: Cassie Cantrell Date: 04-25-2022 Student Exploration: Nuclear Decay Directions: Follow the instructions to go through the simulation. Respond to the questions andprompts in the orange boxes.
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