This element is bromine (Br).
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Nothing, there is no 2d orbital. There can only be an s-orbital and a p-orbital, and there is no d-orbital until the principle quantum number, or "n" equals three, where you can have a 3d orbital. There is no 2d orbital.
The element described is silicon (Si), which has an atomic number of 14. The electron configuration provided corresponds to the electron arrangement of silicon in its ground state.
I believe that is a non-ionic strontium
The electron configuration 1s22s22p63s23p64s23d104p65s1 represents the electron distribution in an atom with 16 electrons, corresponding to the element sulfur (S). The numbers and letters indicate the energy levels (shells) and subshells where the electrons are found in the atom.
Selenium with 6-Valence electrons
It is an element. Elements are composed of atoms, and atoms of elements combine chemically to form compounds.
This chemical element is dysprosium (Dy).