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13 Cards in this Set

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Covalent bond
formed by the sharing of electrons; electronegativity difference < 1.7
Ionic bonds
formed between metal and nonmetal; created by a transfer of electrons; electronegativity difference > 1.7
Nonmetals
tend to gain electrons and from negative ions (ions formed are larger than the neutral atoms: Ionic radii > atomic radii)
Metals
tend to lose electrons and form positive ions.
(Ions formed are smaller than the neutral atoms: Ionic radii < than atomic radii)
Diatomic molecules
considered to have NONPOLAR covalent bonding. i.e. N2 à N=N
Coordinate covalent bonds
a covalent bond where both of the electrons are donated by one of the elements. Usually found in polyatomic ions.
Periodic Table Trends
Trends - as you go from left to right across the table in a period
Metallic character decreases
Atomic radius decreases [See Table P]
Ionization energy increases [See Table K]
Electronegativity increases [See Table K]
Metalloids
have both metal and nonmetal properties. Contact the "staircase".
Transition elements
Produce COLORED SOLUTIONS.
found in the middle of periodic table
Empirical formula
shows the simplest ratio of atoms in a molecule.
Network solids
held together by covalent bonds; high melting & boiling points. ; Extremely poor conductors of heat & electricity. i.e. SiO2, diamond - tetrahedral bonding (Cn), graphite (Cn) - hexagonal bonding
Empirical formula
shows the simplest ratio of atoms in a molecule.
Transition elements
Produce COLORED SOLUTIONS.
found in the middle of periodic table