The likely formula of the compound formed between Ca and O is ________.

Question

Quizplus · Accepted Answer

When Ca (calcium) and O (oxygen) combine, they form a simple binary compound with the formula CaO. The oxidation number of calcium is +2, and the oxidation number of oxygen is -2. Therefore, one calcium ion (Ca+2) and one oxide ion (O-2) combine to form a neutral compound CaO. Choices A, B, and C are not correct because they either include extra elements (such as sulfur and uranium) that are not part of this combination or have incorrect subscripts for the Ca and O atoms.

The Likely Formula of the Compound Formed Between Ca and O