periodic table

• How is the periodic table organized?

  Into periods (rows) and groups (columns)
• What do elements in the same period have in common?

  They have the same number of electron shells
• What happens to the number of electron shells as you move down a period?

  The number of electron shells increases
• What do elements in the same group share?

  Similar electron configurations in their outer shell
• Why do elements in the same group exhibit similar properties?

  Due to similar electron configurations
• What are the four blocks of the periodic table based on subshells?

  • s-block: Outermost electrons in s orbital
  • p-block: Outermost electrons in p orbital
  • d-block: Outermost electrons in d orbital
  • f-block: Outermost electrons in f orbital
• What is the electronic configuration of lithium (Li)?

  1s2 2s1
• What is the electronic configuration of oxygen (O)?

  1s2 2s2 2p4
• What is the electronic configuration of iron (Fe)?

  1s2 2s2 2p6 3s2 3p6 4s2 3d6
• What is the abbreviated electronic configuration of neodymium (Nd)?

  [Xe] 6s2 4f4
• How do you determine the electron configuration of an element using the periodic table?

  1. Identify the period for electron shells
  2. Note the block for the subshell being filled
  3. Write the complete configuration from 1s orbital
• What does identifying the period of an element indicate?

  It shows how many electron shells it has
• What does noting which block an element falls in reveal?

  Which subshell is being filled in the outer shell
• How do you write the complete electron configuration of an element?

  By building up from the 1s orbital