Explain how two atoms of oxygen can be different

Two atoms of an oxygen atom can be different if they are oxygen isotopes. E.g. ¹⁶O, ¹⁷O,¹⁸O.

Explanation:

¹⁶O, ¹⁷O,¹⁸O are the stable isotopes of the Oxygen atom. While all are functionally Oxygen atom, they have different chemical properties. Isotopes are element containing an equal number of protons and a different number of neutrons.

Along with these stable isotopes, a large number of radioactive isotopes are also formed. However, these are unstable and have relatively short life ranging from minutes to just a few seconds. Evaporation, as well as condensation, are amongst two major process that more or less influence heavy and light oxygen atoms ratio in the atmosphere.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante