Electronic Structure

• Electrons surround the atomic nucleus in regions called shells
• An atom of potassium has 1 electron in its outermost shell. 

  In a chemical reaction, will potassium gain or lose 1 electron?

  • lose one electron
• Nitrogen has an atomic number of 7.

  what is the correct electron configuration for an atom of nitrogen:

  • 2, 5
• An atom of oxygen has 6 electrons in the outer shell. In a reaction, it gains 2 electrons. 

  What is the charge of the oxide ion created:

  • 2-