Chem 1205 Spring 2022 Recitation 3 Name: Caroline Dewitz Date: Time: Wed 3.05 Question 1: Determine the Isotope or particle that completes each nuclear reaction (3pts): + on + e 11C1 2360 OVO 23.Th 90 238Ra + Question 2: Uranium-235 has a half-life of 7.04x10 years. If a sample contains 12.Sg of Uranium-235 after 2.82 x 10 years, then how much of the radioactive isotope was in the original sample? Show your work set up and calculations legibly. (Apts): Questions 3: Determine the valence shell for each atom/lon & draw its electron dot diagram (10pts): Atom: Valence Shell: Electron dot diagram: Calcium 2 Cao . P. Phosphorus 5 17 Bromine Iron (II)ion lodide ion