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6 March, 09:02

Beryllium has a nucleus composed of protons and neutrons. Given the data, how many neutrons are in a typical Beryllium nucleus?

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  1. 6 March, 12:34
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    The molar mass of an element mostly consists of the protons and neutrons (electrons are a few thousand times lighter). The atomic number of of Be is 4, meaning it has 4 protons (# of protons is what defines an element, change that, change the element). Since it has 4 protons and its weight is around 9, there are then typically 9-4 = 5 neutrons. The fact that the weight is actually 4.012182 means that in a large sample there are a small percentage of other isotopes.
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