When the negatively charged balloon is brought near the strands of katie's hair, they move to get closer to the balloon, without the balloon actually touching them. this shows that

the correct answer to this question is 2

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.

hypostyle hall;