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Question
The mass of 12C is 12 𝑢 where;1𝑢 = 1
Options:
A .  The mass of 12C nucleus
B .  The mass of 12C nucleus plus 6 electrons
C .  The mass of 12C nucleus plus 12 electrons
D .  The mass of 6 protons and 6 neutrons
Answer: Option B

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