why berillium is placed in fourth place and boron is in fifth place in the periodic table?
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Elements fact for atomic number 4. 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 neutrons changes the isotopes of beryllium,while varying the number of electrons can make beryllium ions
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