CHEM107-Student Exploration: Nuclear Decay answer key-2022 Prior Knowledge Questions (Do these BEFORE using the Gizmo.) The chart below gives the locations, charges, and approximate masses of thre... e subatomic particles. The approximate mass of each particle is given in universal mass units (u). 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. 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. The decay of radioactive atoms generally results in the emission of particles and/or energy. Several types of nuclear decay can be explored with the Nuclear Decay Gizmo™. On the Gizmo, check that Alpha decay and Uranium are selected. CONTINUED.......... [Show More]
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