Physics questions

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1. Why is atomic number better than atomic mass for organizing the elements in the

periodic table? Find three examples to the increasing atomic numbers which do not show increase in atomic masses.

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2. Suppose you and a pair of life preservers are floating down a swift river, as shown. 

You wish to get to either of the life preservers for safety. One is 3 meters downstream 
from you and the other is 3 meters upstream from you. Which can you swim to in the shortest time?

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