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2

This rule usually places the least electronegative atom in the center (EN’s of N = 3.0 and F = 4.0).

Step 2. Determine the total number of valence electrons available. In NF 3, N has five valence electrons, and each F has seven:

• Step 1. Decide on the sequence of atoms. For AB n formulas, place the atom with lower group number in the center.

• In NF 3, N is in Group 5A whereas F is in Group 7A, thus N goes in the center:

Skill 10-1. Using a stepwise method for writing a Lewis structure from a molecular formula

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