Tardigrade
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Tardigrade
Question
Chemistry
In the following figure, the blank X is known as and why?
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Q. In the following figure, the blank $X$ is known as _______ and why?
The Solid State
A
Electron trap, because an electron is present here
7%
B
Metal deficient centre, since negative charge is present here
16%
C
$F$-centre, since it imparts colour to the crystal
72%
D
$F$-centre, since it is responsible for positive charge on the crystal
5%
Solution:
The anionic sites occupied by the unpaired electrons are called $F$-centres from the German word Farbenzenter for colour centre.
