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  • 25-04-2017
  • Chemistry
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Science please help me!!!!

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littlecupid100
littlecupid100 littlecupid100
  • 25-04-2017
1)Atoms are the basic units of matter and the defining structure of elements. Atoms are made up of threeparticles: protons, neutrons and electrons. Protons and neutrons are heavier than electrons and reside in the center of the atom, which is called the nucleus.
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