Which of the elements has the same Lewis dot structure as calcium (Ca)? A. Barium (Ba)
B. Potassium (K)
C. Germanium (Ge)
D. Argon (Ar)

Explanation:

Lewis dot structures illustrate the valence electrons in an element.

Calcium is in group 2.

The other elements in this group are:

So, all these elements have the same lewis dot structures because they have the same number of valence electrons.

Based on the answer choices, choice A is correct.

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.