12. When Fermi bombarded an element in the middle of the periodic table, such as

Question

12. When Fermi bombarded an element in the middle of the periodic table, such as cobalt, with slow neutrons, the element öften captured the neutron resulting in an end product that had an atomic number having a value original nucleus he had bombarded. and beta-decayed, that of the a) equal to b) one higher than c) one lower than d) half as large as e) twice as large as 13. When Fermi bombarded uranium with neutrons in 1935, he believed he had created a) fission b) light elements c) a new kind of radiation d) transuranic elements. 14. When Otto Hahn discovered an isotope of barium resulting from his bombardment of uranium by neutrons, he referred to it as his "barium fantasy" because a) barium is a transuranic element b) barium is chemically unstable c) barium's atomic number was far away from uranium's d) barium's atomic weight was unknown In Feb. 1939, Bohr proposed that the nuclear fission of U-235 was basically different from that of U-238 and Th-232, due to the fact that, of the three isotopes, only U-235 has 15. a) an even number of protons. c) an even number of neutrons. b) an odd number of neutrons. d) an odd number of protons. 19. In March 1940, Frisch calculated the critical mass of U-235 and found it to be much smaller than that of U-238. Part of the reason for this was his assumption that for U-235 than for U-238. a) the fission cross section would be larger b) the fission cross section would be smaller c) the separation between atoms would be smaller d) the separation between atoms would be greater e) the density of the material would be greater.

Explanation / Answer

a) they are isotopes, same atomic number

b) transuranic elements, elements that have a high atomic number than uranium

c) because barium is a transuranic element

d) odd number of neutrons

e) the density of material would be greater

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