Aprincipal quantum number refers to:
the numbered energy levels starting from the nucleus outward
the total energy of an electron
the maximum number of electrons at a given level
the s, p, d, f levels

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

0.88m hope i am correct : )

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