1: The equation 92U238 + 0n1 –> 92U239 represents
an electronic reaction
a molecular reaction
a nuclear reaction
an oxidation reaction
2: In the hydrogen bomb the fusion of hydrogen isotopes results in the production of
barium
helium
plutonium
proton
3: The atom whose nucleus contains the largest number of neutrons is
92U235
92U239
93Np239
94Pu239
4: Neutrons are best absorbed in an atomic pile by rods of
cadmium
calcium
copper
zinc
5: A man-made element is
gold
plutonium
sodium
zinc
6: Radioactive changes differ from ordinary chemical changes because radioactive changes
are explosive
absorb energy
involve changes in the nucleus
release energy
7: Two man-made elements with atomic numbers greater than 92 are
americium and curium
thorium and actinium
U238 and U239
U235 and U238
8: Isotopes of uranium have different
atomic numbers
atomic weights
numbers of planetary electrons
numbers of prot
