Periodic Trends - Electronegativity Answers (Page 3 of 3) in pdf

Periodic Trends - Electronegativity Answers Page 3

oxygen (you can choose these elements only). After you have graphed them, use

the mouse to hover over each point and determine the electronegativity of each.

What is the electronegativity of each element?

H = 2.2

O = 3.44

11. Which one is more electronegative? What effect does one element being more

electronegative have on the bond between them?

Oxygen is more electronegative. This means that oxygen will have a tendency to

have more of the electron density from bonding electrons around it, and hydrogen

will have less, giving the oxygen end of the bond a partial negative charge.

12. Draw a Lewis structure for water. Using what you know about the

electronegativity of each element, show where there will be a slight negative

charge (δ-) and where there will be a slight positive charge (δ+).

There should be a δ- near the oxygen and a δ+ near the hydrogens.

13. Direct your browser to Models 360 at

Choose water from the list of

molecules. Under the display menu, check “Bond Dipole” and “Partial Charge.”

Is the answer consistent with your prediction above?

Yes.

For a more thorough exploration of electronegativity, download the following articles:

Jensen, W.B. 1996. Electronegativity from Avogadro to Pauling: Part I: Origins of the

electronegativity concept. Journal of Chemical Education 73 (1)11–20.

Jensen, W.B. 2003. Electronegativity from Avogadro to Pauling: Part II. Late nineteenth-

and early twentieth-century developments. Journal of Chemical Education 80 (3): 279–

287.

Spencer, J.M. and R.S. Moog. 1996. Part III: Ionization energies, electronegativity polar

bonds and partial charges. Journal of Chemical Education 73 (7): 627–631.

Periodic Trends - Electronegativity Answers Page 3