Respuesta :
There are three electrons for the central metal ion .
What are transition metal and what are the properties of transition metals?
Mainly d- block elements called Transition metal . Any of various chemical elements that have valence electrons.Electrons that can participate in the formation of chemical bonds in two shells instead of one.
There properties are , very good conductor of heat and electricity , they are hard and tough , they have high densities and they are usually worked as catalyst.
The oxidation number of CN is -1 and the total oxidation number on the whole compound is -2.
x+6(-1)→-2
x=4
the electronic configuration of Mn is 3d⁵4s² ,if we remove 4 electrons , then there are 3 electrons are left for central metal .
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