Electron Configuration

• What are the 4 orbitals?

  s,p,d,f (f you dont NEED to know)
• How many electrons can the S orbital hold?

  2
• How many orbital can the P oribital hold?

  6
• How many electrons can the d orbital hold?

  10
• Describe how$1s^2$ is written


  1 - shell number

  S - sub orbital

  2 - number of electrons in sub orbital
• The indicie number adds up to the atomic number
• Write the template of the electron configuration

  1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d
• Write the configuration for Sodium (atomic number, 11)

  $1s^2,2s^2,2p^2,3s^1$
• In the exam, u must draw this arrow when filling in the boxes

  .

  
• Write the configuration of oxygen (atomic number, 8)

  $1s^2,\ 2s^2,\ 2p^4$
• What elements are exceptions?

  Chromium and copper
• Write the configuration for chromium

  $1s^2,\ 2s^2,\ 2p^6,\ 3s^2,\ 3p^6,\ 4s^1,\ 3d^5$

  Essentially, it should have been 4s2 but it gave its electron away to 3d
• write the configuration for copper

  $1s^2,2s^2,2p^6,\ 3s^2,\ 3p^6,\ 4s^1,\ 3d^{10}$