Question

3.7 practice c - lewis structures of compounds
name: becca g.
part 1 - ionic compounds
lithium nitride
formula unit:
aluminum oxide
formula unit:
potassium phosphide
formula unit:
strontium chloride
formula unit:
potassium sulfide
formula unit:

Explanation:

Step1: Determine ion charges for lithium nitride

Lithium (Li) has a +1 charge as it is in Group 1, nitrogen (N) has a - 3 charge as it is in Group 15. To balance the charges, we need 3 Li⁺ ions for 1 N³⁻ ion.
The formula unit is Li₃N.

Step2: Determine ion charges for aluminum oxide

Aluminum (Al) has a +3 charge as it is in Group 13, oxygen (O) has a - 2 charge as it is in Group 16. To balance the charges, we need 2 Al³⁺ ions and 3 O²⁻ ions.
The formula unit is Al₂O₃.

Step3: Determine ion charges for potassium phosphide

Potassium (K) has a +1 charge as it is in Group 1, phosphorus (P) has a - 3 charge as it is in Group 15. To balance the charges, we need 3 K⁺ ions for 1 P³⁻ ion.
The formula unit is K₃P.

Step4: Determine ion charges for strontium chloride

Strontium (Sr) has a +2 charge as it is in Group 2, chlorine (Cl) has a - 1 charge as it is in Group 17. To balance the charges, we need 1 Sr²⁺ ion and 2 Cl⁻ ions.
The formula unit is SrCl₂.

Step5: Determine ion charges for potassium sulfide

Potassium (K) has a +1 charge as it is in Group 1, sulfur (S) has a - 2 charge as it is in Group 16. To balance the charges, we need 2 K⁺ ions for 1 S²⁻ ion.
The formula unit is K₂S.

Answer:

lithium nitride: Li₃N
aluminum oxide: Al₂O₃
potassium phosphide: K₃P
strontium chloride: SrCl₂
potassium sulfide: K₂S