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The mass number is given at the top left of the elements symbol, for example, sodium has a mass number of 23. We know that the atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons.
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The cell nucleus was discovered by Antonie van Leeuwenhoek in the 18th century. He first observed its structure in a sample of salmon blood. ... Nucleus – Structure and Function.
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