At standard pressure, the difference between the freezing point and the boiling point of water, in kelvin degrees, is d. 373 a. 100 b. 180 c. 273

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

iron and sleel

make siroeel