Which of the following statements about electronic configurations of atoms and mononuclear ions, and atomic orbital quantum numbers, are true or false?
1. The electronic configuration of the hydride anion is 1s2.
2. The electronic configuration of Co3+ is [Ar]3d44s2.
3. The secondary (angular momentum) quantum number is always an odd number.
4. The valence electronic configuration of strontium is 4d2.
5. For a given value of l, the number of possible values of ml is always an odd number.