Electromagnetic Spectrum: Short Wavelength, Gamma Rays, X-rays, Ultraviolet, Visble light, Infared, Mircrowave, Radio, Long Wavelength, Group 7 Periodic Table: Top, Florine, Chlorine, Bromine, Iodine, Astatine, Bottom, Gases in the atmosphere: From the most , Nitrogen, 78%, Oxygen, 21%, other gases, 1%, to the least,

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