The image below has the question that needs to be answered and the choices to chose from. I would really appreciate it if someone could answer this question for me . I will also mark brainliest! :)

A

Explanation:

Using process of elimination, I know that this can be decomposition because, to decompose is to break down, while these are clearly forming together. Also B seems to be wrong. It says that the mass will be less, but because we are merging them together the mass should be greater.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.