Here is the answer. I am not sure how to explain it! Sorry!
The answer would be the third one listed, Refraction
Answer:
between metal and nonmetal ions
Explanation:
Potassium and Chloride forms an ionic bond.
(K+) + (Cl-) = KCl
Potassium is under Group IA (Alkali Metal), wherein elements under this group can easily lose electrons.
Chlorine is under Group VII (Halogens), in which these elements can gain electrons easily.
The inner shell electrons on potassium will merge with the outer shell of electrons of chlorine to make potassium chloride.
Answer:
Block Y is heavier than Block X.
Explanation: