It has one carbon atom (relative atomic mass = 12.0) and two oxygen atoms (relative atomic mass = 16.0): M r of CO 2 = 12.0 + 16.0 + 16.0 = 44.0 It could also be calculated this way: M r of CO 2 ...
All oxygen atoms have 8 protons and all sodium ... Note that you can work out the number of neutrons by subtracting the atomic number from the mass number. In this example, it is 35 – 17 ...
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