The element is Cobalt of atomic mass( Co, Z= 27)
What is electron transition ?
Because of the electromagnetic radiation's emission or absorption, atoms and molecules undergo electronic transitions (typically UV or visible). Planck's equation, E = h, relates the energy change connected to a transition to the frequency of the electromagnetic wave.
Energy of photons released as a result of an electron transition:
hν=E(n2)−E(n1) =13⋅
6×Z^2(1/ n1^2−1/n2^2)eV
So, Kα rays, from (n=2) to (n=1)
7.46×10^3=13.6×Z^2(1 - 1/2^2)
Z= 27
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