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What information must be known in order to calculate the mass number if an atom?
Wiki User
∙ 14y ago
The mass number = the number of protons + the number of nuetrons. Each of these particles is considered to have a mass of 1 amu. (Atomic Mass unit) For example, Aluminum has 13 protons and 14 nuetrons, so it's mass number = 27.
Wiki User
∙ 14y ago
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