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Electronegativity, Yo !

Electronegativity, Yo !. Niquisha , RayDizzle , Ashwayze. Definition:. A measure of the ability of an atom in a molecule to attract electrons to itself. Trends:. Electronegativity decreases down a column.

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Electronegativity, Yo !

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  1. Electronegativity, Yo! Niquisha, RayDizzle, Ashwayze

  2. Definition: • A measure of the ability of an atom in a molecule to attract electrons to itself.

  3. Trends: • Electronegativity decreases down a column. • The inner core electrons shield the positive charge of the nucleus from the outer electrons. • So as the orbital size increases, it is more difficult for the protons of the atom to attract electrons.

  4. Trends: • Electronegativity increases across a row from left to right. • As you move across a period, the nucleus gains protons and is therefore more attractive to electrons. • http://en.wikipedia.org/wiki/Electronegativity

  5. Highest • Fluorine • Needs one more electron, so has a higher tendency to form a negative ion.

  6. Lowest • Francium • Easier to lose an electron than gain seven to become stable .

  7. Units: • Nope.

  8. Exceptions (Down a Column): • Generally, the shielding effect of the d group isn’t as strong because the new electrons are put INSIDE, not added to the outer oribital. This means that as the atomic number increases, the atomic radius doesn’t. • Instead of decreasing down a column, most of the transition metal electronegativity values increase.

  9. Exceptions (Across a Period): • In the transition metals, some elements do not follow the trend of increasing from left to right. • Mo = 2.2, but Tc = 1.9.

  10. Exceptions: • Noble Gases…duh. • They’re already stable and have full orbitals. Their tendency to attract electrons is minimal to nonexistent.

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