The+Atom

__Atomic Spectra:__ __An Explanation of Atomic Spectra:__
 * passing an electric current through a gas in a neon tube energizes the electrons of the atoms of the gas, and causes them to omit light.
 * when atoms absorb energy electrons move ino higher energy levels and these electrons lose energy by emitting light when they return to lower energy levels.
 * each specific frequency of visible light emitted corresponds to a particular color.
 * when the light passes the frequencies of light emitted by an element seperate into discrete lines to give the **atomic emission spectrum** by the element.
 * each discrete line in an emission spectrum corresponds to one exact frequency of light emitted by the atom.
 * no two elements have the same emission spectrum.
 * In the Bohr model the lone electron in the hydrogen can have only specific energies.
 * the lowest possible energy is called **g**r**ound state.**
 * in the ground state the electrons principal quantum number is 1.
 * the light emitted from an electron moving from a higher to a lower energy level has a frequency directly proportional to energy change of the electron.
 * lyman series are the lines at the UV end of the hydrogen spectrum. n=1
 * the lines in the visible spectrum are the Balmer series. n=2
 * paschen series are the transition from n=2 to n=3.
 * n=4 and n=5 exists too.
 * the quantum mechanical model is based on the description of the motion of material objects as waves.