Galileo made claims to support copernicu's heliocentric model of the the solar system. What was necessary for the heliocentric model to become as wide accepted as it is today.

i think its 100.

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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.