Question

complete the table below. some binary molecular compounds name chemical formula phosphorus pentachloride tetraphosphorus heptasulfide phosphorus trichloride tetraphosphorus trisulfide

Explanation:

Step1: Recall naming - prefix rules

Prefix "penta -" means 5. Phosphorus pentachloride has 1 phosphorus (P) and 5 chlorine (Cl) atoms, so the formula is $PCl_{5}$.

Step2: Analyze "tetra -" and "hepta -"

Prefix "tetra -" means 4 and "hepta -" means 7. Tetraphosphorus heptasulfide has 4 phosphorus (P) and 7 sulfur (S) atoms, so the formula is $P_{4}S_{7}$.

Step3: Consider "tri -" for trichloride

Prefix "tri -" means 3. Phosphorus trichloride has 1 phosphorus (P) and 3 chlorine (Cl) atoms, so the formula is $PCl_{3}$.

Step4: Analyze "tetra -" and "tri -" for trisulfide

Prefix "tetra -" means 4 and "tri -" means 3. Tetraphosphorus trisulfide has 4 phosphorus (P) and 3 sulfur (S) atoms, so the formula is $P_{4}S_{3}$.

Answer:

name	chemical formula
tetraphosphorus heptasulfide	$P_{4}S_{7}$
phosphorus trichloride	$PCl_{3}$
tetraphosphorus trisulfide	$P_{4}S_{3}$