Mercury orbits the sun at more than ten times the sun speed of Neptune

Yes, this is true.

Explanation: It only takes 88 days for Mercury to orbit around the sun. No other planet travels around the sun faster.

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.