Heat transfer between two substances is affected by specific heat and the ? Chemical composition of the substances .
State of matter of the substances at room temperature.
Thermal equilibrium of the substances.
Amount of time and area of physical contact between the substances.

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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.