Which electron configuration represents excited excited state for a potassium Atom

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

Which of the following is not a characteristic of s waves?

Describe the magnitude of the buoyant force