Question

write the Colour and Spectra ​

Answer 1

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Some trivalent ions$\ (M^3⊕)$ are coloured in solid state as well as in solution. The colour of lanthanoid ion is due to f-f transitions which correspond to energy in the visible region of the electromagnetic spectrum. The colour of ions having nf electrons is about the same as those having (14 – n)f electrons. (where n is an integer 1-13).

Answer 2

Explanation:

A spectral color is a color that is evoked in a normal human by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths, also known as monochromatic light. Every individual wavelength of visible light is perceived as a spectral color, in a continuous spectrum; the colors of sufficiently close wavelengths are indistinguishable for the human eye.

A spectral color is a color that is evoked in a normal human by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths, also known as monochromatic light. Every individual wavelength of visible light is perceived as a spectral color, in a continuous spectrum; the colors of sufficiently close wavelengths are indistinguishable for the human eye.The spectrum is often divided into named colors, though any division is somewhat arbitrary; the spectrum is continuous. Traditional colors in English include: red, orange, yellow, green, blue, and violet. In some other languages the ranges corresponding to color names do not necessarily agree with those in English.