How many protons electrons and neutrons does a atom with the atomic number 50 and mass number 125 contain?

Protons: 50, Neutrons: 75, Electrons: 50

Explanation:

The atomic number, which in this case is 50, determines the number of protons and electrons an atom has. Take the atomic number and subtract the number of protons to get the number of neutrons.

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.