Obtain and Communicate Information 1. SEP Obtain Scientific Information Conduct research to learn about the history of atomic models and the scientists who developed the models. Identify any experimental evidence and reasoning that supported each model. I

the answer is the first option

explanation:

just googled it m8. not that hard

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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.