Step 1: Arsenic (EN = 2.18) is less electronegative than oxygen (EN = 3.44) and hydrogen only forms 1 bond hence arsenic is the central atom.
Step 2: The total number of valence electrons present in H3AsO4
Group Valence Electrons
As 5A 1 × 5 e– = 5 e–
H 1A 3 × 1 e– = 3 e–
O 6A 4 × 6 e– = 24 e–
Total: 32 valence e–
Step 3: As will go in the center while H and O are terminal atoms.
The complete Lewis structure is:
Draw the Lewis structure for each compound.
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