As more information was gathered about the structure of the atom, atomic models changed over time. Maxwell Planck discovered that the energies of electrons were quantized. In other words, electrons could only exist in certain energy levels. Which model best shows
this concept?

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

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.