Chemical reactions are more likely to happen when electrons are in an excited state
electrons are in the lowest possible energy level
O electrons are part of a full octet
electrons are in the ground state

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a