- Nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts, releasing large amounts of energy. Uranium-235 is commonly used in nuclear fission, where a neutron causes its nucleus to split into lighter elements like barium and krypton, along with more neutrons. - This can trigger a self-sustaining chain reaction where the released neutrons cause other uranium atoms to split. The rate of fission (R) must be maintained to have a steady reaction. Radioactive decay was discovered in 1896 and provided insights into nuclear energy generation.

4. 3
•
•
•

5. •
(Fission)
-235
1 235 141 92 1
0 n U
92 56 Ba Kr 30 n Q
36

6. 235U
(Chain Reaction)

7. •

8. •

9. (R)
N
dN
R N
dt
dN
N
dt
-1

10. (radioactivity) 
4 0
2 He 1 e
=>

11. 1896 Henri
Becquerel
81

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240,000 ml
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Imported Coal
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60,000
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40,000
% 6
20,000
1% 1% 1% 1% 1% 9
2 1 1 0 0 % 8% 8% 7% 7% 6% 6% 6% 6% 5%
0
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Year

14. http://en.wikipedia.org/wiki/File:Nuclear_fis
sion.svg#file