Question

aluminum selenide
formula unit:______
rubidium fluoride
formula unit:______
sodium bromide
formula unit:______
strontium oxide
formula unit:______
cesium phosphide
formula unit:______

Explanation:

Step1: Determine ion charges

Aluminum (Al) has a +3 charge, selenium (Se) has a - 2 charge. To balance the charges, we need 2 Al and 3 Se.

Step2: Write formula unit

The formula unit for aluminum selenide is $Al_2Se_3$.

Step3: For rubidium fluoride

Rubidium (Rb) has a +1 charge, fluorine (F) has a -1 charge. The formula unit is RbF.

Step4: For sodium bromide

Sodium (Na) has a +1 charge, bromine (Br) has a -1 charge. The formula unit is NaBr.

Step5: For strontium oxide

Strontium (Sr) has a +2 charge, oxygen (O) has a -2 charge. The formula unit is SrO.

Step6: For cesium phosphide

Cesium (Cs) has a +1 charge, phosphorus (P) has a -3 charge. To balance the charges, we need 3 Cs and 1 P. The formula unit is $Cs_3P$.

Answer:

Aluminum selenide: $Al_2Se_3$
Rubidium fluoride: RbF
Sodium bromide: NaBr
Strontium oxide: SrO
Cesium phosphide: $Cs_3P$