Refer to the measurements in the table to determine which unidentified metal has the lowest density.
metal volume mass
a 12.5 cm3 122 g
b 15.2 cm3 129 g
c 13.1 cm3 101 g
d 18.7 cm3 126 g
metal a
metal b
metal c
metal d

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.