Question

how many valence electrons are in the phosphorus tribromide molecule pbr₃?

Explanation:

Step1: Find valence electrons of P

Phosphorus (P) is in group 15, so it has 5 valence electrons.

Step2: Find valence electrons of Br

Bromine (Br) is in group 17, so each Br has 7 valence electrons. There are 3 Br atoms.

Step3: Calculate total valence electrons

Total valence electrons = valence electrons of P + (valence electrons of Br × 3)

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Answer:

26