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 a chemical element with the symbol H and atomic number 1. While hydrogen fills stars and gas planets, here on Earth, it is rarely in a naturally free state. Rather, itâs bonded to other elements. For example, when combined with oxygen, it forms water-H20.