Future testing can prove a scientific theory to be incorrect

The proof lies in being able to disprove

A hypothesis or model is called falsifiable if it is possible to conceive of an experimental observation that disproves the idea in question.10‏/05‏/2018

Explanation:

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.