- Why phosphorus is in period 3 in periodic table?

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I m in Engineering school.The past papers help me .Should I print them?How to get organized? What causes DNA to curve? Suppose you measure a piece of wood at 42.1 cm. find the percent erroe in your measurement. please show work in you can, thanks? Has ungabunga left the solar system yet? I need help with this problem. I have to get differential equations so that I can make a model to later simulate in Matlab/Simulink?