What type of gases are present in the statosphere,ionosphere etc
there is no specific gas as such.. . but regarding ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth.
and about stratosphere it contains half the gases present in ATMOSPHERE.