Physics, 26.02.2021 16:10 Yalmar6874

*(e) An atom of beryllium has an atomic number of 4 and a mass number of 9. Describe the numbers and arrangements of the protons, neutrons and electrons in this atom.

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*(e) An atom of beryllium has an atomic number of 4 and a mass number of 9. Describe the numbers an...

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