Leonard decides to create 5.0 g of the artificial element neptunium 236. The element is radioactive with a half life of 1.5 x 105 years.
a. What is meant by an “artificial element”? (1)
b. Calculate the initial activity of the neptunium 236 sample. The number of nuclei in 236 g of neptunium are 6.02 x 1023. (3)
c. Neptunium 236 has three possible decay modes which are shown in the table below. The products of each type of decay are also shown.
a) A synthetic element is one of 24 chemical elements that do not occur naturally on Earth: they have been created by human manipulation of fundamental particles in a nuclear reactor, a particle accelerator, or the explosion of an atomic bomb; thus, they are called "synthetic", "artificial", or "man-made".
b)
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