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Parts on an atom

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  • 1. The parts of an Atom
  • 2. The atom An Atom: The most basic unit of matter. An atom has a dense nucleus and a cloud of negatively charged electrons around it. If matter is what everything is made of, and matter is made of atoms… Then, everything is really made of atoms!
  • 3. An Electron Electron: A subatomic particle with a negative electrical charge. An electron’s mass is so small that it is generally not even considered.
  • 4. A Nucleus Nucleus: The dense center of an atom containing protons and neutrons. Nucleus
  • 5. A Proton A Proton: A subatomic particle within the nucleus of an atom that has a positive charge.
  • 6. Neutron A Neutron: A subatomic particle within the nucleus of an atom that has a neutral charge.
  • 7. Energy Level The energy level of an atom is as follows: 2,8,8 The first shell has two electrons The second shell has 8 electrons The third shell has 8 electrons MEMORIZE: 2,8,8!!!!!!!!!!
  • 8. Atomic Number The atomic number is the number mainly associated with the element and represents the number of protons present in the atom.
  • 9. Mass Number The total number of protons and neutrons. The mass of an atom comes from the protons and neutrons. Therefore, the mass includes the masses of each added together. This number can be found at the bottom, typically. Mass Number
  • 10. Atomic Mass Sub atomic particles are measured in AMU’s. AMU stands for Atomic Mass Unit. Every proton has a mass of 1 AMU Every Neutron has a mass of 1 AMU Remember, electrons don’t have a measureable mass.
  • 11. Element A pure chemical substance consisting of ONE type of atom.