In the nucleus
Electrons exist as pairs. Although, electrons hate each other, and only go as pairs as a last resort.
Electrons are found in orbitals outside the nucleus of an atom.
Free electrons exist in the conduction band, which is the highest energy band in a material where electrons are free to move and conduct electricity.
No
it doesn't exist
valence electrons
The maximum number of electrons that can exist in 4f orbitals is 14.-pg. 110 Modern Chemistry table 2:)
The symbol An doesn't exist.
Between electrons and the atomic nucleus a repulsion exist.
you cant...you doesnt exist
Nope.... it cant
These electrons are called "excited".