Diphosphorus pentoxide and barium oxide produce barium phosphate

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

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.