What scientists added negatively-charged particles to the model of the atom?

Select the atomic models that belong to the same element

What must happen before a body cell can begin mitotic cell division

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?