2) The first atomic explosion was detonated in the desert north of Alamogordo, New Mexico, on July 16, 1945. What fraction of the strontium-90 (t1/2 = 28.8 yr) origi- nally produced by that explosion still remains as of July 16, 2008?

Review Topics) [References] Use the References to access important values if needed for this question. How many protons, neutrons and electrons are there in a neutral atom of the isotope with the nuclear symbol: 80 Sr 38 protons: neutrons: electrons: Submit Answer Retry Entire Group 7 more group attempts remaining Cengage Learning | Cengage Technical Support 63°F Mostly su

) Sketch a graph of the variation in neutron number   with atomic number  for elements with stable nuclei.  Plot  on the -axis against  on the -axis and use a single line to show the general trend. Extend your -axis to  92.  Shade regions on the same graph to show where unstable radionuclides may be found that decay through  1.  Alpha particle emission Beta -ve particle emission Beta postive particle emission

4) How many years old is a person who has lived for 1 billion seconds?