1. What did Antoine Lavoisier's experiments demonstrate? Energy is neither lost nor gained during a chemical change,
Mass is neither lost nor gained during a chemical change,
Atoms always split into pairs during a chemical change.
Matter can be created during a chemical change, just as the rust was created.

explanation:

0.07 g/cm³

1.37 g/cm³

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.