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Stress Pattern

Number of Syllables

Primary Stress

VA lence

2

first

Suggested exercises

1. Tell a student why valence is a useful concept, but that molecular orbital theory is somtimes necessary to explain reality.
F

Useful words

keep track of numbers of bonds
predict reactivity of elements in a group
delocalized electrons
non-bonding and anti-bonding orbitals
orbital symmetry
three-center bonds
F

2. Show a student how the valency of each element in the second row of the periodic table is determined.
F

number of electrons in the 2-shell
octet rule
share pairs of electrons
boron, carbon, nitrogen, oxygen, fluorine
F

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