Chemical Bonding Worksheets Page 5
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22In terms of quantum mechanics, we can also show the “electron clouds” or “electron
density” for two H atoms combining to form the H
molecule:
2
H atom
H atom
H
molecule
2
Note: In the H
molecule, the electron density is concentrated between the nuclei +
2
because the two H atoms share the electrons equally.
Ex. 2: Use electron dot formulas to represent the reaction described.
→
hydrogen atom
+
fluorine atom
HF molecule
–
–
Note in HF, H has 2 e
(like He) and F has 8 valence e
(like other Noble gases).
We can also represent the HF molecule as follows:
H
F
This overlapping region is the covalent bond where electrons are shared.
In terms of quantum mechanics, we can also show the electron density in the HF molecule:
Note: In the HF molecule, the electron density is concentrated between the nuclei but
appears more concentrated around the F atom. This is due to a property called
electronegativity.
CHEM 121 Tro Chapter 10 F2012
page 5 of 22
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