Early atomic theories could not explain the of elements

Explanation:

But I think properties of the element

because at past people were not well informed about the properties of element so later modern periodic table replaces with mendellive periodic table correcting it's bud and mistakes.

idk what is it? is this a question that you know the answer or u dont

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.