Question 4 Not yet answered Marked out of 1.00 'i" Hag question The halflife of 2:112; is 1.62 \"0%. If 2.04 mg of radium were present the mass of radium remaining atter4.86 x103 5! would be, expressed in scientic notation, in x 10"\" mg. The value ofb, to three signicant gures. is Question 5 A theoretical isotope with an atomic number of Z undergoes the following decay series: alpha, alpha, beta negative, Not yet alpha, and beta positive. What is the atomic number of the resulting nucleus? answered Marked out of Select one: 1.00 O a. Z+ 1 Flag question O b. Z - 4 O c. Z-6 O d. Z - 1QueStion12 Use the following information to answer the next question: hot yet answered A PET (Positron Emission Tomography) scanner is an emergent technology that allows Marked out of for matter-antimatter annihilation reactions to take place within a patient's brain. The ma energy released in these reactions is used to create very detailed imagery for medical diagnosis. "I.\" Flag question a a n _1e+1e-+20':r In the positron-electron annihilation reaction used in PET scanners. the amount of energy released in the reac ion, in scientic notation written as ahc x10\" Mel-I. The values of a. h, c, and d, are _. Express your answers in the proper order. For example. it you feel that a = 1. b = 2. c = 3. and d = 4, then you would enter 1234 in the answer pox