PCR Master Mix Calculations Determine the number of reactions you will run: Since we are running a gradient, calculate for 12 rxn at 25 ul per rxn

The correct answer is c

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

D. h2o + h2o > h3o + oh- confirmed.