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Electron Basics. Atom Review. Protons and neutrons are bound together to make the atomic nucleus Protons have a positive electrical charge Neutrons are neutral and have no electrical charge. What is an electron?. It is a sub-atomic particle that can be found around the atomic nucleus.

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PowerPoint Slideshow about ' Electron Basics' - carlos-cervantes


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Presentation Transcript
atom review
Atom Review
  • Protons and neutrons are bound together to make the atomic nucleus
  • Protons have a positive electrical charge
  • Neutrons are neutral and have no electrical charge
what is an electron
What is an electron?
  • It is a sub-atomic particle that can be found around the atomic nucleus.
  • It has a negative electric charge
  • Its mass is about 2000x less than a proton or neutron
where is an electron
Where is an electron?
  • Danish physicist Neils Bohr proposed the idea that electrons can be found around the nucleus in different energy levels or shells.
  • One cannot pinpoint the location of an electron, only about where it is in a specific energy level or shell
electron shells
Electron Shells
  • There are 7 electron shells (How many periods, or rows are on the periodic table?)
  • Each shell can hold a specific number of electrons
    • # of elements in the period = # of electrons that shell can hold
  • Q: How many electrons can the 2nd electron shell hold?
    • A: 8
electron shell capacity 1st 18 elements
Electron Shell Capacity - 1st 18 elements
  • 1st Shell: 2 e-
  • 2nd Shell: 8 e-
  • 3rd Shell: 8 e-
  • Electrons fill each shell from the inside out. Ex: the 1st shell is filled first
valence electrons
Valence Electrons
  • Electrons in the outermost shell are called valence electrons.
  • They are involved in chemical bonding and reactions.
  • We will talk much more about these electrons when we talk about chemical reactions in later chapters.
bohr diagrams
Bohr Diagrams
  • A conceptual model of an atom
  • # of n and # of p are written in the nucleus (center circle)
  • # of e- are filled in each shell until it is full (How many can each shell hold?)
    • Once a shell is full, you add another circle and continue.
bohr diagram practice
Bohr Diagram Practice
  • Pick 3 elements from the first 18 elements, and create Bohr Diagrams for those elements.
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