Question

listed below are 4 negatively charged ions (nonmetals). write the formula for the combination of the positive ions (metals) with all 4 negative ions. negative ions: s p i n a) li write the formulas for the compounds, combining li with each negative ion. 1 li₂s 2 li₃p 3 4 b) pb write the formulas for the compounds, combining pb with each negative ion. 1 2 3 4 d) fe (+2) write the formulas for the compounds, combining fe with each negative ion. 1 2 3 4 e) al write the formulas for the compounds, combining al with each negative ion. 1 2 3 4

Explanation:

Step1: Identify ion charges

Negative ions: $\text{S}^{2-}$, $\text{P}^{3-}$, $\text{I}^-$, $\text{N}^{3-}$; Positive ions: $\text{Li}^+$, $\text{Pb}^{2+}$, $\text{Fe}^{2+}$, $\text{Al}^{3+}$

Step2: Balance charge for Li

Cross charges to neutralize:

• $\text{Li}^+$ + $\text{S}^{2-}$ → $\text{Li}_2\text{S}$
• $\text{Li}^+$ + $\text{P}^{3-}$ → $\text{Li}_3\text{P}$
• $\text{Li}^+$ + $\text{I}^-$ → $\text{LiI}$
• $\text{Li}^+$ + $\text{N}^{3-}$ → $\text{Li}_3\text{N}$

Step3: Balance charge for Pb²⁺

Cross charges to neutralize:

• $\text{Pb}^{2+}$ + $\text{S}^{2-}$ → $\text{PbS}$
• $\text{Pb}^{2+}$ + $\text{P}^{3-}$ → $\text{Pb}_3\text{P}_2$
• $\text{Pb}^{2+}$ + $\text{I}^-$ → $\text{PbI}_2$
• $\text{Pb}^{2+}$ + $\text{N}^{3-}$ → $\text{Pb}_3\text{N}_2$

Step4: Balance charge for Fe²⁺

Cross charges to neutralize:

• $\text{Fe}^{2+}$ + $\text{S}^{2-}$ → $\text{FeS}$
• $\text{Fe}^{2+}$ + $\text{P}^{3-}$ → $\text{Fe}_3\text{P}_2$
• $\text{Fe}^{2+}$ + $\text{I}^-$ → $\text{FeI}_2$
• $\text{Fe}^{2+}$ + $\text{N}^{3-}$ → $\text{Fe}_3\text{N}_2$

Step5: Balance charge for Al³⁺

Cross charges to neutralize:

• $\text{Al}^{3+}$ + $\text{S}^{2-}$ → $\text{Al}_2\text{S}_3$
• $\text{Al}^{3+}$ + $\text{P}^{3-}$ → $\text{AlP}$
• $\text{Al}^{3+}$ + $\text{I}^-$ → $\text{AlI}_3$
• $\text{Al}^{3+}$ + $\text{N}^{3-}$ → $\text{AlN}$

Answer:

A) Li

1. $\text{Li}_2\text{S}$
2. $\text{Li}_3\text{P}$
3. $\text{LiI}$
4. $\text{Li}_3\text{N}$

B) Pb (using +2 charge, common for such compounds)

1. $\text{PbS}$
2. $\text{Pb}_3\text{P}_2$
3. $\text{PbI}_2$
4. $\text{Pb}_3\text{N}_2$

D) Fe (+2)

1. $\text{FeS}$
2. $\text{Fe}_3\text{P}_2$
3. $\text{FeI}_2$
4. $\text{Fe}_3\text{N}_2$

E) Al

1. $\text{Al}_2\text{S}_3$
2. $\text{AlP}$
3. $\text{AlI}_3$
4. $\text{AlN}$