AS Chemistry - Electronegativity

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Define electronegativity
The ability of an atom to attract the bonding pair of electrons towards itself in a covalent bond.
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What causes electronegativity?
An uneven distribution of electrons in a covalent bond
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What happens to electronegativity across a period and why?
It increases - same number of shells, atomic radius decreases and greater nuclear attraction
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What happens to electronegativity down a group?
It decreases - more shells, atomic radius increases, more shielding, weaker nuclear attraction
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What is the polarity of non symmetrical molecules with polar bonds?
Polar because bonds cannot cancel
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What is the polarity of symmetrical molecules with polar bonds?
Non polar because symmetrical molecules cancel
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Why is CH4 non polar?
C and H have very similar electronegativity.
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Other cards in this set

Card 2

Front

What causes electronegativity?

Back

An uneven distribution of electrons in a covalent bond

Card 3

Front

What happens to electronegativity across a period and why?

Back

Preview of the front of card 3

Card 4

Front

What happens to electronegativity down a group?

Back

Preview of the front of card 4

Card 5

Front

What is the polarity of non symmetrical molecules with polar bonds?

Back

Preview of the front of card 5
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