Question

decide whether each pair of elements in the table below will form an ionic compound. if they will, write the empirical formula and name of the ionic compound formed in the spaces provided.

element #1	element #2	forms ionic compound?	empirical formula of ionic compound	name of ionic compound
calcium	chlorine	yes no
oxygen	rubidium	yes no
barium	lithium	yes no

Explanation:

Step1: Recall ionic - compound formation rule

Ionic compounds form between a metal and a non - metal.

Step2: Analyze sulfur and strontium pair

Sulfur is a non - metal and strontium is a metal. They form an ionic compound. Strontium forms a $Sr^{2 + }$ ion and sulfur forms a $S^{2 - }$ ion. The empirical formula is $SrS$ and the name is strontium sulfide.

Step3: Analyze calcium and chlorine pair

Calcium is a metal and chlorine is a non - metal. Calcium forms a $Ca^{2+}$ ion and chlorine forms a $Cl^{-}$ ion. To balance the charges, the empirical formula is $CaCl_{2}$ and the name is calcium chloride.

Step4: Analyze oxygen and rubidium pair

Oxygen is a non - metal and rubidium is a metal. Rubidium forms a $Rb^{+}$ ion and oxygen forms an $O^{2 - }$ ion. The empirical formula is $Rb_{2}O$ and the name is rubidium oxide.

Step5: Analyze barium and lithium pair

Both barium and lithium are metals. They do not form an ionic compound.

Answer:

element #1	element #2	Forms ionic compound?	empirical formula of ionic compound	name of ionic compound
calcium	chlorine	yes	$CaCl_{2}$	calcium chloride
oxygen	rubidium	yes	$Rb_{2}O$	rubidium oxide
barium	lithium	no