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What is Electronegativity?

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University Course Reader · STEM

The large electronegativity difference between oxygen and hydrogen gives the O–H bond its strongly polar character.

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Overview

Electronegativity is how strongly an atom pulls on the electrons it shares in a chemical bond. When two bonded atoms pull unequally, the shared electrons sit closer to the stronger atom — that end becomes slightly negative, the other slightly positive. Such a bond is called polar.
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Overview

Electronegativity = how much of an electron hog an atom is. Some atoms split the shared pair like saints; others drag it to their side and dare you to say something. Unequal pull means one end goes negative — and the bond now has drama. 😎

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Detail

The pull is scored from about 0.7 to 4.0 on the Pauling scale, with fluorine at 4.0 pulling hardest, and electronegativity rises going right and going up the periodic table, so fluorine, oxygen and nitrogen pull strongly while bottom-left metals barely pull. What a bond becomes depends on the gap between the two atoms' values. A small gap, as in carbon and hydrogen, means nearly even sharing, which is a nonpolar bond. A medium gap, as in oxygen and hydrogen, means shared but shifted, giving a polar bond with a negative end and a positive end. A large gap, as in sodium and chlorine, means the stronger atom takes the electron outright and both become ions, which is an ionic bond. The consequence is everywhere: water's polar bonds make each molecule a tiny magnet, which is why water dissolves salt.
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Detail

Fluorine: 4.0, final boss, undefeated. Map hack: hog-level rises up and to the right, so the top-right crew (F, O, N) pulls hardest and bottom-left metals basically donate. The gap writes the plot: small gap means a fair split and no drama, medium gap means shared but shifted — the passive-aggressive bond — and a huge gap means the hog just TAKES the electron, both become ions, and "sharing" leaves the chat. The payoff: water is bent and polar, making every molecule a tiny magnet. That's why it dissolves your sports drink, kills your phone, and hosts all known life. 😎

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Analogy

Two people, one blanket: equal sleepers keep it centered all night — fair share, nonpolar — while one blanket hog drags it to their side, leaving the other person not blanket-less but cold and slightly bitter: a polar arrangement, one side covered, one exposed. The extreme case is the hog taking the whole blanket and rolling over — nobody calls that sharing, just two separate sleep situations held together by the bed. That's ionic, and the hog's pull strength is electronegativity.
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Analogy

"Sharing" fries: equal friends keep the carton in the middle — peace — while one fry hog lets it slowly migrate to their side, where you can still reach but you're stretching, and the whole table sees the tension. Final form: they lift the carton onto their own tray. That's ionic — two separate food situations at one table, friendship held together by seating alone.
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Formal definition — The same term, explained the usual way

Electronegativity quantifies an atom's tendency to attract shared bonding electrons, most commonly expressed on the Pauling scale, on which fluorine's value of approximately 4.0 is maximal. It increases across a period with rising effective nuclear charge and decreases down a group with increasing atomic radius. The electronegativity difference between bonded atoms predicts bond character, from nonpolar covalent through polar covalent to ionic, and underlies molecular dipole moments and solvent behavior.

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