The answers is ATP it took me a long time to find it but here you go. hope i helped
Answer:
The balanced equation is 2K(s) + Cl2(g)→2KCl(s)
Draw eight circles and nine more in a big circle = this represents your nucleus
draw eight electrons (since electrons = protons in neutral elements) outside of it (2 in one ring, then 6 in a second ring)