Which of the following is correct regarding the electron energy shell configuration of a phosphorus atom (atomic number 15)?
A. 2, 5, 5
B. 2, 8, 5
C. 2, 8, 18
D. 10, 5
E. None of the above

Fill in the blanks for the following statements: the rms speed of the molecules in a sample of h2 gas at 300 k will be times larger than the rms speed of o2 molecules at the same temperature, and the ratio µrms (h2) / µrms (o2) with increasing temperature. a not enough information is given to answer this question b sixteen, will not change c four, will not change d four, will increase e sixteen, will decrease