2.55 grams of KClO3 are dissolved in 25.2 grams of water.  The solution has a final volume of 27.3 ml. 
The molar mass of KClO3 is 122.55 g/mol. 
 
Calculate the concentration of KClO3 in the solution by the following two methods:
1) percent by mass:  
2) molarity: 
 
Round answers to the 100th's place and include units. 
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you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

increased stability in the completion of fluorine's outer shell.

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