When a nucleus of U-238 absorbs a neutron and becomes U-239, a beta emission, then another beta emission results in
A) Th-239.
B) Pa-239.
C) U-235.
D) Pu-239.
E) Pb-206.
Question 2
Plutonium is radioactively toxic
A) in any form.
B) although less toxic than radium.
C) both of these
D) neither of these