Electronegativity Revision

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  • Created by: ElishaG
  • Created on: 20-02-17 11:43
What is electronegativity?
The ability for an atom to attract the bonding pair of electrons in a covalent bond.
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What is Pauling electronegativity values?
The Pauling scale is used to compare electronegativity values.
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What are the trends in electronegativity across the periodic table?
1)Same number of shells.2)Atomic radius decreases.3)More protons.4)Greater nuclear attraction for bonded electron pair.5)Electronegativity increases.
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What are the trends in electronegativity down a group?
1)More shells.2)Atomic radius increases.3)More protons far outweighed by more distance to nucleus and increases shielding,4)Weaker nuclear attraction for bonded electrons.5)Electronegativity decreases.
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When does a permanent bond dipole arise ( a polar bond).
When covalently bonded atoms have different electronegativities.
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Why is ammonia a polar molecule?
1)N is more electronegative than H.2)Permanent bond dipole generated.3)Non-symmetrical molecule.4)Permanent bond dipoles cannot cancel.
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Why is CBr4 a non-polar molecule?
1)Br is more electronegative than C.2)Permanent bond dipole formed.3)Symmetrical molecule.4)Permanent dipoles cancel out.
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Why is methane a non-polar molecule?
1)C and H have very similar electronegativity.2)Non-polar bonds generated.
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Why are symmetrical molecules always on polar?
The dipoles across each polar bond (if present) cancel each other out.
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Other cards in this set

Card 2

Front

What is Pauling electronegativity values?

Back

The Pauling scale is used to compare electronegativity values.

Card 3

Front

What are the trends in electronegativity across the periodic table?

Back

Preview of the front of card 3

Card 4

Front

What are the trends in electronegativity down a group?

Back

Preview of the front of card 4

Card 5

Front

When does a permanent bond dipole arise ( a polar bond).

Back

Preview of the front of card 5
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