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Atomic Structure Unit (Worksheet #3) Ms. Wallace. Bohr Models of Atoms. Principle Energy Levels. PEL 1 holds _____ electronsEquation: PEL 2 holds _____ electrons. PEL 3 holds _____ electrons. Different Atoms. Draw the Bohr model for a Hydrogen – 2 and Helium - 4 atom. How are these atoms different? ................
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