The most pronounced metallic properties of the atom a) Ca b) Be c) Ba d) Sr

In this case, it is necessary to take into account the possibility of giving back valence electrons. If this opportunity is greater, the more pronounced the metallic properties of these elements. In turn, this depends on the radius of the valence electron orbits. If we turn to the periodic system of Mendeleev, we see that barium has the largest radius of the outer electron orbit. And this is the answer that it (Ba) has the most pronounced metallic properties.