1) Electron dot structures for the elements:
- Nitrogen: N with 5 dots around it (one on each side, one on top, one on bottom, and one on each of the four sides, with one side having a pair)
- Bromine: Br with 7 dots around it (one on each side, one on top, one on bottom, and one on each of the four sides, with three sides having pairs)
- Oxygen: O with 6 dots around it (one on each side, one on top, one on bottom, and one on each of the four sides, with two sides having pairs)
- Carbon: C with 4 dots around it (one on each side, one on top, one on bottom, and one on each of the four sides, with no pairs)
- Sulfur: S with 6 dots around it (one on each side, one on top, one on bottom, and one on each of the four sides, with two sides having pairs)
- Fluorine: F with 7 dots around it (one on each side, one on top, one on bottom, and one on each of the four sides, with three sides having pairs)
2) Lewis structures for the molecules:
- SF₃⁻: S in the center bonded to three F atoms with single bonds, and one lone pair on S, each F has three lone pairs, and the structure has a negative charge
- NOBr: N in the center bonded to O with a double bond and to Br with a single bond, N has one lone pair, O has two lone pairs, Br has three lone pairs
- N₂O: N≡N-O with the first N having one lone pair, the second N having no lone pairs, and O having two lone pairs, and the structure has a positive charge on the first N and a negative charge on O
- SiF₃⁻: Si in the center bonded to three F atoms with single bonds, and one lone pair on Si, each F has three lone pairs, and the structure has a negative charge
- BrF₃: Br in the center bonded to three F atoms with single bonds, and two lone pairs on Br, each F has three lone pairs
- SCl₃⁺: S in the center bonded to three Cl atoms with single bonds, and one lone pair on S, each Cl has three lone pairs, and the structure has a positive charge
- CO₃²⁻: C in the center bonded to three O atoms with one double bond and two single bonds, the double-bonded O has two lone pairs, the single-bonded O atoms each have three lone pairs, and the structure has a negative charge on each single-bonded O, and a total of two negative charges
- NH₄⁺: N in the center bonded to four H atoms with single bonds, and no lone pairs on N, and the structure has a positive charge
- SO₄²⁻: S in the center bonded to four O atoms with two double bonds and two single bonds, the double-bonded O atoms each have two lone pairs, the single-bonded O atoms each have three lone pairs, and the structure has a negative charge on each single-bonded O, and a total of two negative charges
Parent Tip: Review the logic above to help your child master the concept of lewis structures worksheet with answers.
