We’re being asked to determine a valid Lewis structure for AsO33-. We first need to determine the total number of valence electrons present in the molecule:
Group Valence Electrons
As 5A 1 × 5 e– = 5 e–
O 6A 3 × 6 e– = 18 e–
Total: 23 valence e–
The rules for drawing Lewis structures involving As, and O are as follows:
• As: Prefers to form four (4) bonds
• O: Prefers to form two (2) bonds and 2 lone
• O also more electronegative so it will have the negative charges.
Complete the Lewis dot structure for AsO33-.
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