<span>Magnesium is the central atom of chlorophyll molecule. Chlorophyll is essential in plants for the process of photosynthesis. Chlorophyll are pigments absorbing sunlight. It is made up of porphyrin ring. At the centre of this ring magnesium forms the basic part.</span>
<span>λν = c
c= speed of light= 3.0x10^8 m/s
</span>λ=wavelength
v= frequency
Plug and Chug.
The answer is B hope this is right
1s: 2
2s: 1
2p: 0
3s: 0
3p: 0
4s: 0
3d: 0
4p: 0
5s: 0
Hope that helped