Choose the correct statements.

Options

A. for an atom in which n=3 electrons are valence electrons, the inner 1s, 2s and 2p electrons shield a 3d electron from the nuclear charge more than a 3p and a 3p more then a 3s
B. 3d electron experiences a smaller attraction to the nucleus so it is higher in energy
C. The different degrees of penetration to the nucleus of atomic orbitals with the same value of an different values of I lead to energies in the orders `sltpltdltfltglth` for a many electron atoms
D. all values of 1 for the same n are equal in energy for the hydrogen atom as there is only a single electron

Answer

A, B, C, D