Remember that cr has a ground-state electronic configuration of [ar]4s13d5 and cu has a ground state electronic configuration of [ar]4s13d10. also, remember that when you ionize a transition metal, you always remove electrons from the ns subshell before the (n-1)d subshell. in other words, a cr3+ ion has a configuration of [ar]3d3 and not [ar]4s13d2. the reason for this is that, even though the 6 valence electrons of cr are spread out through the 4s and 3d orbitals as if the 4s and 3d subshells were the same energy, when it comes to ionizing the atom, the 4s orbital is actually slightly higher in energy so that the 4s electron is removed first. which statement(s) is/are true? i. in a calcium atom, the 2px and 3px orbitals have the same size and shape. ii. in a lithium atom, the 2s and 2p subshells have different energies. iii. the 3px, 3py, and 3pz orbitals look the same, but they point in different directions. iv. in a cr atom, a 4s electron has higher energy than a 3d electron. group of answer choices iii, iv only ii, iii only i, ii, iii, iv ii, iii, iv only iii only