Basics of Atomic Structure

Been awhile since Chem 1? Let’s cover some of the essentials from general chemistry that you’ll need for this course. 

Recap of Protons and Neutrons

  • Atomic Number: Number of protons in the atom.
  • Atomic Mass: Total number of protons and neutrons in the atom. 
  • Isotopes: Atoms that have the same atomic number but differing atomic mass.

Example: Understanding the hydrogen isotopes. 

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Recap of Electrons

  • Shell: Region of space that electrons orbit around the nucleus in.
  • Orbital: Region of space within a shell with exactly enough space for two electrons. 
  • Ion: An atom that has an unequal number of electrons and protons.  

The Three Principles of Electron Configuration

Problem: PRACTICE: Determine the number of protons, neutrons and electrons in the following atoms.

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Problem: PRACTICE: Determine the number of protons, neutrons and electrons in the following atoms.

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Problem: PRACTICE: Determine which of the three principles of electron configuration is being broken in the electron diagrams below.

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Problem: PRACTICE: Determine which of the three principles of electron configuration is being broken in the electron diagrams below.

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