A+E Networks. On this day in 1969, Americaâs first automatic teller machine (ATM) makes its public debut, dispensing cash to customers at Chemical Bank in Rockville Center, New York.
This modification of the energy levels of a hydrogen atom due to a combination of relativity and spin-orbit coupling is known as fine structure.
Hydrogen is an atom that contains an electron and a single proton. It is found at the very upper left of the periodic chart. The symbol for Hydrogen is the letter H. Hydrogen is both the lightest and most abundant element in the universe. Here are some data: