structure Flashcards
electronegativity is
power of an atom to attract the pair of electrons in a covelant bond towards itself
when does uneven electron distribution occur
when the elements in a covelant bond have different electronegativities
most electronegative atom
fluorine
nuclear charge affect on electronegativity and why
increasing charge causes increasing electronegativity
attraction exists between positive protons and negative electrons in energy levels of an atom
more protons = greater nuclear attraction of these electrons
atomic radius affect on electronegativity and why
increasing radius decreases electronegativity
electrons further from the nucleus are less strongly attracted to the nucleus
shielding affect on electronegativity and why
filled energy levels shield the effect of nuclear charge reducing the attraction between outer e- and nucleus
increased number of inner shells and subshells results in a decreased electronegativity
down a group affect on electronegativity and why
decrease in electronegativity down the group
although nuclear charge increases
increased shielding with the addition of extra e- shells this means there is also a…
larger atomic radius
across a period affect on electronegativity and why
electronegativity increases across a period
nuclear charge increases with increasing proton number
shielding remains relatively constant
smaller atomic radius
what dictates if a molecule will be polar
if there is a difference in the electronegativities
what dictates what type of bond is formed
difference in electronegativities
what electronegativity difference is covelant bond
0.3 to 1.7
atoms will get a partial charge
which atom are electrons drawn to
the more electronegative one
atoms will get a partial charge
how to identify if a molecule is polar
polar bonds can be arranged in a way which will cancel out the polarity
if the shape is symetrical then the molecule wont be polar
