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An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the element

An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the element
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An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the element

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User Ben Keil
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beryllium: mass number of an atom = number of neutron + number of proton in the nucleus = 5+4=9
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User Karolin
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