Name ______Date ______Period ______# ______
Counting Atoms, Type of Bonding, and Lewis Structures to Illustrate Bonding Types
Instructions: For each molecule or compound, determine the correct number of atoms in each and also give the total number of atoms that make up the molecule/compound. Use your periodic table to decide whether the molecules/compounds form ionic or covalent bonds. (Remember: Ionic bonds form between a metal and nonmetal, and covalent bonds form between two or more nonmetals.) Then, draw the Lewis structures for each showing different symbols for each atom’s valence electrons. Show whether there is a transfer of electrons with an arrow pointing from the atom that loses it electron(s) to the atom that gains it (ionic bonding) or a sharing of electrons with a circle/loop showing a shared pair(s) of electron between the atoms (covalent bonding). This information will be used tomorrow to perform a lab activity so be as accurate as possible.
Molecule/Compound Formula / Number of Atoms of Each Type / Total Number of Atoms / Ionic or Covalent / Lewis Structure showing bonding and give the cation and anion and their oxidation states if it is an ionic compound
H2 / Hydrogen = 2 / 2 / Covalent (diatomic molecule) / H ○ ● H
H―H
NaCl / Sodium =
Chlorine = / Ionic (occurs between a metal and nonmetal) / Lewis Structure & Bonding:
Cation & Anion: Na+1 and Cl -1 = Na ― Cl
2H2O
(2 molecules of water) / Hydrogen =
Oxygen =
*tricky one / 6
Na2O / Sodium =
Oxygen =
CaCl2 / Calcium =
Chlorine =
CH4 / Carbon =
Hydrogen =
CO2 / Carbon =
Oxygen =
CHCl3 / Carbon =
Hydrogen =
Chlorine =