The ability of an atom in a molecule to attract electrons is best quantified by the . a. electron charge-to-mass ratio
b. electronegativity
c. first ionization potential
d. diamagnetism
e. paramagnetism

b. electronegativity

Explanation:

The ability of an atom in a molecule to attract electrons is best quantified by the _Electronegativity_.

Electronegativity is the ability of an atom to attract a shared pair of electron which is loosely held. Polar molecules often possess such properties. The Halogen group (group 17) is famous for such property because it has the highest electronegativity in periodic table.  

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roughly 20,000 years ago the great ice sheets that buried much of asia, europe and north america stopped their creeping advance. within a few hundred years sea levels in some places had risen by as much as 10 meters .