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The mass of carbon is 12 u because it has 6 neutrons and:

A8 protons
B4 protons
C9 protons
D6 protons
Answer & Solution
Correct answer: D. 6 protons
1. Mass number is protons plus neutrons. 2. Six and six make twelve. 3. Carbon has 6 protons. _Source: syllabus Science, Ch 4 'Structure of the Atom'_
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