For each of the positive ions listed in Column 1, use the periodic table to find in Column 2 the total number of electrons that ion contains. The same answer may be used more than once. Column 1Column 2

Al3+ a. 2

Fe3+ b. 10

Mg2+ c. 21

Sn2+ d. 23

Co2+ e. 24

Co3+ f. 25

Li+ g. 36

Cr3+ h. 48

i. 76

j. 81

Which of these conditions most likely produces an unstable isotope?

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.

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel