| Atoms � Constituent Parts I |
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| � | Atoms contain 3 kinds of particles: |
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| � | Electrons �
in orbits���� Negatively charged |
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| �� Very low mass (1/1836 mp) |
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| � | Protons�� -- in nucleus�� Positively charged |
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| �� More �massive� |
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| � | Neutrons � in
nucleus�� Electrically neutral |
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| �� mn mp |
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