A molecule contains 18 atoms and undergoes a physical change. How does the physical change affect the total number of atoms of each element? It remains the same.
It increases
It changes to zero
Olt decreases

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.

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Answerit is not a suspension or colloid mixture, it is a solution mixture;