The different types of atoms (elements) give off or absorb different spectral lines because each type of atom has its own unique pattern of electron orbitals , and no two sets of orbitals are exactly alike .
All elements and compounds has a discrete and a continuous spectrum . Discrete spectra are associated with transition between energy state in which all electrons are bound . According to modern physics , change in the state of an electron results in radiation either bring absorbed or emitted . Acceleration leads to change in electron state .
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