Based upon the following diagram, propose a possible identity for atoms X and Y. Explain your answer in terms of the periodic table and ionic bonding. Lastly, explain why the atoms bond in this ratio.

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.