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how the electrons which are present in outermost shell get coloured by absorb visible light .what happened in excited state

 how the electrons which are present in outermost shell get coloured by absorb visible light .what happened in excited state
 

Grade:12

2 Answers

Umakant biswal
5349 Points
8 years ago
@ jaya 
when the outermost electron absorb some amount of energy in the form of radiation , then it will exicted intoi the high energy level of the same subshell , and in that high energy level , the f centers are there to exhibit the colour of the compound .. 
this is besically called as d-d and f-f transition , 
jaya sri lakshmi
37 Points
8 years ago
thakx for your answer but what is meant by f-centers and what reaction had happened there.And how colour is exhibited

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