(a) The Group VII elements of the Periodic Table are called Halogens. ) List these elements in order of increasing atomic number indicating their physical states. (i1) What accounts for the variation in the physical states of the Halogens?

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.