Identify the correct statements from the following: A. Heisenberg uncertainty principle is applicable to electrons. B. The size of 2p_x orbital is less than the size of 3p_x orbital. C. The energy of 2s orbital of H atom is equal to the energy of 2s orbital of Li. D. The electronic configuration of Cr is [ Ar ] 3d^5 4s^1 Choose the correct answer from the options given below:
B. A, B and D Only
Statement A is correct. Heisenberg's uncertainty principle is applicable to microscopic particles such as electrons. Statement B is correct. The size of an orbital increases with an increase in the principal quantum number n. Thus, the size of the 3p_x orbital is greater than that of the 2p_x orbital. Statement C is incorrect. The energy of an orbital depends on the effective nuclear charge. Since the nuclear charge of Li (Z=3) is greater than that of H (Z=1), the energy of the 2s orbital of Li is lower than that of the 2s orbital of H. Statement D is correct. Chromium (Z=24) has an anomalous electronic configuration of [ Ar ] 3d^5 4s^1 due to the extra stability of the half-filled d-subshell. Therefore, statements A, B, and D are correct. Answer: A, B and D Only
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