| Group 27 | Group Name : group 27 | 
| Group Members : Elysia Lim  | 
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| 1. 
 One carbon atom can differ from another in the number of neutrons and the number of electrons.  | 
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| 2. 
 The 14 and 15 is the mass number of N which is the total number of protons and neutrons in an atom. N15 has one more neutrons than N14. They have the same number of protons and electrons.  | 
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| 3. 
 a) 94  | 
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| 4.  
 E-fuel rods  | 
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| 5.  [276]  | 
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| 6.  [278]  | 
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| 7.  [280]  | 
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| 8.  [282]  | 
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| 9.  [284]  | 
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| 10.  [286]  | 
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