Unit 2 Standards Review

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Periodic Behavior and Ionic Bonding



  1. Students know how to use the periodic table to identify alkali metals, alkaline earth metals and transition metals, semimetals, nonmetals, and halogens.

    • carbon is an example of a
    • lithium is an example of an
    • iron is an example of a
    • phosphorus is an example of a
    • calcium is an example of an
    • chlorine is an example of a
    • silicon is an example of a

  2. Students know how to use the periodic table to identify trends in ionization energy, electronegativity, and the relative sizes of ions and atoms.

    • atomic radius tends to down a group
    • atomic radius tends to across a period
    • ionization energy tends to down a group
    • ionization energy tends to across a period
    • Anions have a charge. They are than the atoms from which they were formed.
    • Cations have a charge. They are than the atoms from which they were formed.


  3. Students know how to use the periodic table to determine the number of electrons available for bonding.

    • Electrons available for bonding are called electrons.
    • Elements in the same group have the same number of available for bonding.
    • Carbon has electrons available for bonding
    • Hydrogen has electron available for bonding
    • Nitrogen has electrons available for bonding
    • Oxygen has electrons available for bonding
      <LI.All of the halogens have electrons available for bonding

  4. Students know salt , such as NaCl, are repeating patterns of positive and negative ions held together by electrostatic attraction.

    • Students know atoms can combine by transferring electrons to form bonds
    • Electrostatic attraction = attract
    • Test Hint: The word "salt" ALWAYS refers to bonding.