Which of the following statements is true?
A. The 2s and 2p orbitals for the hydrogen atom have the same energy.
B. The energy of electromagnetic radiation increases as its frequency decreases.
C. An electron in the n=1 state in the hydrogen atom can go to the n=3 state by emitting electromagnetic radiation at the appropriate frequency.
D. The exact position and velocity of an electron can be measured simultaneously from accurate experiments.
E. In the usual order of filling, the 3 d orbital is filled before the 3s orbital for transition metal elements.
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