Question

match the number of valence electrons with the correct compound.
ch₄
pbr₃
of₂
ch₂o
o₃
sicl₄
click for list
8
12
18
20
26
32

Explanation:

Step1: Determine valence - electrons of CH₄

Carbon (C) has 4 valence electrons and hydrogen (H) has 1 valence electron. For CH₄, 4 (from C)+4×1 (from 4 H atoms)=8.

Step2: Determine valence - electrons of PBr₃

Phosphorus (P) has 5 valence electrons and bromine (Br) has 7 valence electrons. For PBr₃, 5 (from P)+3×7 (from 3 Br atoms)=26.

Step3: Determine valence - electrons of OF₂

Oxygen (O) has 6 valence electrons and fluorine (F) has 7 valence electrons. For OF₂, 6 (from O)+2×7 (from 2 F atoms)=20.

Step4: Determine valence - electrons of CH₂O

Carbon (C) has 4 valence electrons, hydrogen (H) has 1 valence electron, and oxygen (O) has 6 valence electrons. For CH₂O, 4 (from C)+2×1 (from 2 H atoms)+6 (from O)=12.

Step5: Determine valence - electrons of O₃

Oxygen (O) has 6 valence electrons. For O₃, 3×6 = 18.

Step6: Determine valence - electrons of SiCl₄

Silicon (Si) has 4 valence electrons and chlorine (Cl) has 7 valence electrons. For SiCl₄, 4 (from Si)+4×7 (from 4 Cl atoms)=32.

Answer:

CH₄: 8
PBr₃: 26
OF₂: 20
CH₂O: 12
O₃: 18
SiCl₄: 32