A student made the lewis dot diagram of a compound as shown. Ca is written with two dots shown on its top. Cl is written on the right side of ca. Cl has seven dots around it. An arrow is shown from one dot on ca toward the vacant space around cl. Similarly, another arrow is shown from the other dot on ca toward the vacant space around cl. On the top, the art title is written as students lewis dot model. What is the error in the lewis dot diagram?.