Which of the following best describes what happens to the substance between t4 and t5?

(a) the molecules are leaving the liquid phase.
(b) the solid and liquid phases coexist in the equilibrium.
(c) the vapor pressure of the substance is decreasing.
(d) the average intermolecular distance is decreasing.
(e) the temperature of the substance is increasing.

Between the temperature points and , the molecules are leaving the liquid phase.

Explanation:

Reading the conversion of states of matter through a graphical representation; we can easily see that the matter is converting from the liquid phase to gaseous phase respective to the temperatures to .

As the solid is heated at a constant rate at 1 atm pressure, it changes its state from solid to liquid and then liquid to gas consistently.

As the matter crosses the temperature , it leaves it's liquid phase and starts transforming into its gaseous version. It's quite obvious that the temperature will go on increasing until the matter reaches its gaseous state.

Icant see the pictures 

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.