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16 Cards in this Set
- Front
- Back
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metals ____ electrons
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LOSE and become POSITIVELY CHARGED IONS, atoms then get smaller
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non-metals _____ electrons
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GAIN and become NEGATIVELY CHARGED IONS, atoms then get bigger
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isoelectronic
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two ore more atoms (or ions) that have the same electronic configuration
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crystal lattice structure
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the arrangement of positive and negative ions in an iconic compound
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properties of iconic compounds
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strong bonds which mean high boiling and melting points
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electronegativity
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the tendency to attract electrons in a chemical bond (found on table s)
high electronegativity-attracts & holds on to electrons low electronegativity-tends to give electrons away |
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1.7 rule
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if the electronegativity is 1.7 or higher, it is an ionic bond
if the electronegativity is 1.6 or lower, it is a covalent bond |
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how to know if a compound is ionic or covalent:
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for binary compounds: subtract the electronegativities of each element and follow the 1.7 rule
for ternary compounds: if the compound contains a polyatomic ion, it is IONIC....if the compound does not, it is COVALENT |
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what is the VESPR theory
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un-bonded electrons repel bonded electrons so that the geometry of a molecule will change to one in which both are bonded and unbounded electrons spread out as far away as possible
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SNAP
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s- symmetrical
n-non polar a-asymmetrical p-polar |
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network substances
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think of diamonds-
strong, repeating covalent bonds high boiling & melting points insoluble in water |
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bond breaking is ___thermic
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ENDO, which means energy is absorbed
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bond formation is ___thermic
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EXO, which means energy is released
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van der waals law
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the larger the molecule, the greater the Van Der Waals forces and the higher the boiling point
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strength of attractive forces
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hydrogen bonding > dipole-dipole > van der waals
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what kind of energy is stored in a chemical bond?
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potential energy
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