Which of the folloiwng would you expect to be most similar: nitrogen chlorine, barium, flourine and sulfur?

In an energy pyramid, which level has the most available energy?

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Reaction rate depends on how many molecules are coming into contact with each other with enough energy to react. increasing the temperature of the reactants will increase -