Which of the following statement(s) is/are true ? A. If two orbitals have the same value of (n + l) , the orbital with lower value of n will have lower energy. B. Energies of the orbitals in the same subshell increase with increase in atomic number. C. The size of 2p_x orbital is less than the size of 3p_x orbital. D. Among 5f , 6s , 4d , 5p and 5d orbitals, none of the orbitals have 2 radial nodes. Choose the correc

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Statement A: According to the (n+l) rule, if two orbitals have the same (n+l) value, the orbital with the lower value of n has lower energy. This statement is true. Statement B: As the atomic number increases, the effective nuclear charge ( Z_ eff ) increases. The energy of an orbital is proportional to - Z_ eff ^2 n^2 . Thus, the energy becomes more negative, meaning the energy of the orbitals in the same subshell decreases with an increase in atomic number. This statement is false. Statement C: The size of an orb