1 4,18. 2  Shingles in caused by the same virus that causes chickenpox-varicella-zoster virus. 3  Shingles is a painful infection of the nerve supplying an area of skin and is accompanied by a localised skin rash.
The electrons on the outermost energy level of the atom are called valence electrons. The valence electrons are involved in bonding one atom to another. The attraction of each atomâs nucleus for the valence electrons of the other atom pulls the atoms together.
an electron can have.An electron that is as close to the nucleus as it can be. is in its lowest energy level.The farther an electron is from the nucleus,the. higher the energy level that the electron occupies.The difference in energy. between two energy levels is known as a quantum of energy.