Question

for each row in the table below, decide whether the pair of elements will form a molecular or ionic compound. if they will, then enter the chemical formula of the compound. if the elements will form more than one compound, enter the compound with the fewest total number of atoms. you may assume all chemical bonds are single bonds, not double or triple bonds.

element #1	element #2	compound formed?	chemical formula
barium	oxygen	ionic<br>molecular<br>neither
calcium	cesium	ionic<br>molecular<br>neither

Explanation:

Step1: Analyze barium - beryllium pair

Both barium and beryllium are metals. Metals do not form ionic or molecular compounds with each other. So the answer for this pair is neither.

Step2: Analyze barium - oxygen pair

Barium is a metal and oxygen is a non - metal. They form an ionic compound. Barium has a + 2 charge ($Ba^{2+}$) and oxygen has a - 2 charge ($O^{2 -}$). The chemical formula of the compound is $BaO$.

Step3: Analyze calcium - cesium pair

Both calcium and cesium are metals. Metals do not form ionic or molecular compounds with each other. So the answer for this pair is neither.

Answer:

element #1	element #2	compound formed?	chemical formula
barium	oxygen	ionic	$BaO$
calcium	cesium	neither