Question

barium oxide is a binary ionic compound. it is used in special camera lenses. write the chemical formula of barium oxide. refer to a periodic table.

Explanation:

Step1: Determine barium ion

Barium (Ba) is in Group 2 of the periodic table. It loses 2 electrons to form a $Ba^{2 + }$ ion.

Step2: Determine oxide ion

Oxygen (O) is in Group 16 of the periodic table. It gains 2 electrons to form an $O^{2 - }$ ion.

Step3: Write the formula

For a neutral ionic compound, the charges must balance. The ratio of $Ba^{2 + }$ to $O^{2 - }$ is 1:1. So the chemical formula is $BaO$.

Answer:

$BaO$