Why do some atoms not follow the Aufbau rule? 1: Some elements are just more naturally full of more energy placing electrons in higher energy sublevels 2: To make chemistry harder than it already is 3: Filled and half filled orbitals are stable 4: There is no instance where everyone follows the rules as they should

Filled and half filled orbitals are stable

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.