Give the nuclear symbol for the isotope of potassium for which A = 40 ? Enter the nuclear symbol for the isotope (e.g., He). • View Available Hint(s) ΑΣφ a a 18

Does any element with ZS 92 match the description? If you checked yes, give the symbol of an element with Z S 92 description that matches. An element in Period 4 and Group 3A. O Yes O No A metalloid in Group 5A. O Yes O No A halogen with a higher atomic number than silicon. O Yes O No A main-group element in Period 2. O Yes O No O

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Please only answer part b. Thank you! (b) The negative muon (μ−) behaves like a heavy electron, with the same charge as the electron but with a mass 207 times as large as the electron mass. As a moving μ− comes to rest in matter, it tends to knock electrons out of atoms and settle down onto a nucleus to form a "one-muon" atom. For a system consisting of a nucleus of platinum (Pt195 with 78 protons and 117 neutrons) and just one negative muon, predict the energy in eV of a photon emitted in a transition from the first excited state to the ground state. The high-energy photons emitted by transitions between energy levels in such "muonic atoms" are easily observed in experiments with muons.