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5 October, 00:28

What is the mass of an atom that has 4 protons, 5 neutrons and 4 electrons? 5 8 9 13

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  1. 5 October, 01:45
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    The element with atomic number 4 is Berilium and its atomic mass is 8 (4 protones + 4 neutrons) and is placed in the second period and II A group. This element shows Valency 2. In other means the answer you are looking for is 8.
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