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The element with atomic number 4 is beryllium, which means each atom of beryllium has 4 protons. A stable atom would have 4 neutrons and 4 electrons. Varying the number of .

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Apr 25,  · Here, the atomic number is 4, thus beryllium contains 4 electrons and 4 protons. Since, the atomic mass is 9, the number of neutrons is equal to 5 (= 9 - 4). Hope this helps.