Silver
Non-ionic strotium
The electron configuration 1s22s22p63s23p64s23d104p65s1 denotes the electron distribution in the atoms. It represents the orbitals where electrons are likely to be found in the atom. In this case, the notation indicates the distribution of electrons in the various energy levels and sublevels of the atom, following the Aufbau principle.
I believe that is a non-ionic strontium
Selenium with 6-Valence electrons
This element is bromine (Br).