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BONDING UNIT TIER3

BONDING UNIT TIER3. Apply electronegativity values and the position of two elements on the periodic table to determine the type of dominant bonding that occurs; ionic, polar covalent or nonpolar covalent

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BONDING UNIT TIER3

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  1. BONDING UNIT TIER3 • Apply electronegativity values and the position of two elements on the periodic table to determine the type of dominant bonding that occurs; ionic, polar covalent or nonpolar covalent • Describe the lattice structure of ionic compounds and apply this to explain the physical properties of ionic compounds • Describe the model of metallic bonding and apply this to explain the physical properties of metals • State and explain the relationship between number of bonds, bond length and bond strength.

  2. Apply electronegativity values and the position of two elements on the periodic table to determine the type of dominant bonding that occurs; ionic, polar covalent or nonpolar covalent Electronegativity -is the ability to attract electrons. -The trend in electronegativity is that it decreases down a group and increases across a period. -Metals want to give up electrons so they have very low electronegativity values.(Francium has the lowest value) -Nonmetals want to gain the electrons so they have very high electronegativity values.(Fluorine has the highest value) -It is generally recognized that a difference of 1.8 unit between the electronegativity of the atoms forming the compound will result in a compound that is predominately ionic. Below this value the bonds are predominately covalent Location on Periodic Table The further apart the elements are on the periodic table the more likely they will be ionic.

  3. Describe the lattice structure of ionic compounds The forces of electrostatic attraction between ions cause them to surround themselves with ions of opposite charge. As a result the ionic compound takes on a predictable 3-D crystalline structure known as an ionic lattice.

  4. Apply the lattice structure to explain the physical properties of ionic compounds

  5. Describe the model of metallic bonding and apply this to explain the physical properties of metals

  6. State and explain the relationship between number of bonds, bond length and bond strength.

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