Select the correct answer. Which statement is true for a heating curve? OA It shows how the pressure of a substance changes when heated. OB. It shows how the temperature of a substance changes when heated. It shows how the volume of a substance changes when heated. OD. It shows how the mass of a substance changes when heated.

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above