What tells the number of protons in the nucleus of every atom of an element

The atomic number displayed on the periodic table gives the proton number.

For example, neon is the 10th element, with 10 protons.

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.

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