[i]indicate the following on the graph. the initial temperature of the gas was 87 degrees celsius. the boiling point is 80 degrees celsius and freezing point was 50 celsius .formed cooled to -30 degrees celsius.
[ii]explain the points when the temperature remained constant for some time

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.