Which covalent bond is most polar?
Out of..
a) H-F
b) H-C
c) H-H
d) H-N
???
Answer:
a) H-F
Fluorine has the highest electronegativity.
Polarity is based on electronegativity. Electronegativity is the tendency for an atom to attract electrons to itself in a chemical bond. This is mainly due to two factors, atomic radius and shielding. The smaller the radius the more influence the positive nucleus has attracting electrons. Remember, atomic radius decreases across the periodic table. Also shielding is due to energy levels of inner electrons being added as you go down a column on the periodic table. These full energy levels "shield" the positive charge of the nucleus from pulling in valence electrons.
Therefore, the more electron negative the atom the more polar the bond can be since the electronegative atom can pull the electron closer to itself. Flourine, F, is the most electronegative atom since it has a very small radius and little shielding, therefore would have the most polar bond.
I would pick a.
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Decribe three signs that a chemical reaction has taken place and ex. of each sign?
a) H-F
b) H-C
c) H-H
d) H-N
???
Answer:
a) H-F
Fluorine has the highest electronegativity.
Polarity is based on electronegativity. Electronegativity is the tendency for an atom to attract electrons to itself in a chemical bond. This is mainly due to two factors, atomic radius and shielding. The smaller the radius the more influence the positive nucleus has attracting electrons. Remember, atomic radius decreases across the periodic table. Also shielding is due to energy levels of inner electrons being added as you go down a column on the periodic table. These full energy levels "shield" the positive charge of the nucleus from pulling in valence electrons.
Therefore, the more electron negative the atom the more polar the bond can be since the electronegative atom can pull the electron closer to itself. Flourine, F, is the most electronegative atom since it has a very small radius and little shielding, therefore would have the most polar bond.
I would pick a.
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