Hey everyone! This is rather late (the topic as in), because we actually learnt about it in February but I realised I never wrote anything on it! D: So here is a bit of information now...
Also, the nucleon number/mass number can be derived by adding up the number of protons and the number of neutrons together. Let's take the element Silver as an example. It has a 47 protons, and 61 neutrons, which means it has a nucleon number/mass number of 108. The various values can be taken/derived from the Periodic Table. The image below will show you how to get the different values.
However, during the exam, the periodic table will be given to you, and the atomic mass will be a whole number, so you do not need to worry but getting a weird number! One more thing, the atomic mass is the nucleon number/mass number!
(Credits to: http://kaffee.50webs.com/Science/activities/Chem/Activity.Atomic.Structure.1a.html for the photo!)
We also learnt about isotopes. What are isotopes, you ask? Isotopes are atoms of the same element, but they have different number of neutrons. The average atomic mass of an element is calculated based on the average mass of all the isotopes available.
That's all for now! (: Hope you learnt more!
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