Usually when heat is transferred to a substance, the temperature of the substance increases. However, while a substance is melting or boiling, its
temperature does not change, even though heat is being transferred to it.
What is the scientific term used for the heat transferred in this situation?

answer is d because it is trust me

i believe the answer is 5,000

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.