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Atoms and Elements. Subatomic Particles. Atom - Smallest particle of an element. Subatomic Particles - Atoms are composed of protons, neutrons, and electrons. Nucleus - Small dense positively charged center of an atom .

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subatomic particles
Subatomic Particles
  • Atom-Smallest particle of an element.
  • Subatomic Particles- Atoms are composed of protons, neutrons, and electrons.
  • Nucleus- Small dense positively charged center of an atom.
  • Proton- Subatomic particle that has a positive charge and is found in the nucleus of an atom.
  • Electron- negatively charged subatomic particle found in an area outside the nucleus of an atom.
  • Neutron- Subatomic particle with no electric charge that is found in the nucleus of an atom.
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Atoms have their electrons arranged in layers called shells
  • 1st level- 2 electrons max.
  • 2nd Level- 8 electrons max.
  • 3rd level- 18 electrons max.
  • 4th level- 32 electrons max.
using the periodic table to understand makeup of atoms
Using the Periodic Table to understand makeup of atoms
  • Atomic Number- Number of protons in the nucleus.
  • Atomic Mass- Average of the masses of the existing isotopes of an element.
  • Mass number- the sum of the protons and neutrons in its nucleus.