What does the atomic number tell you

Hello

The mass number tells us the number (the sum of nucleons) of protons and neutrons in the nucleus of an atom.

Source: https://socratic.org/questions/what-does-the-mass-number-tell-us

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a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.