Question

1. choose the best answer using the periodic table. what is the name of this compound: p₂s₅? a) diphosphorus pentasulfide b) phosphorus pentasulfide c) phosphorus sulfide d) diphosphorus sulfide 2) choose the best answer using the periodic table. what is the correct chemical formula for a compound made from k and n? a) k₃n b) k₂n c) k₃n₂ d) kn

Explanation:

Step1: Name $\text{Mg}_3\text{P}_2$

Magnesium ($\text{Mg}^{2+}$) + phosphide ($\text{P}^{3-}$) gives magnesium phosphide.

Step2: Name $\text{P}_4\text{S}_5$

Tetraphosphorus ($\text{P}_4$) + pentasulfide ($\text{S}_5$) gives tetraphosphorus pentasulfide.

Step3: Formula for $\text{K}^+$ and $\text{N}^{3-}$

Balance charges: $3\text{K}^+$ + $\text{N}^{3-}$ gives $\text{K}_3\text{N}$.

Answer:

1. magnesium phosphide
2. tetraphosphorus pentasulfide
3. $\text{K}_3\text{N}$