Molecular orbitals are similar to atomic orbitals is that:.
A. They can hold two electrons of opposite spin.
B. In general, bond order is related to bond strength.
C. We refer to molecular orbitals in which the greatest electron probability is between the nuclei as sigma molecular orbitals.
D. Pi orbitals are antibonding orbitals.
E. Atomic orbitals are lower in energy than bonding molecular orbitals.
F. None of the above statements is true.

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.