An atom of boron has an atomic number of 5 and an atomic mass of 11. the atom contains (2 points) 5 protons, 6 electrons, and 5 neutrons. 11 protons, 11 electrons, and 5 neutrons. 5 protons, 5 electrons, and 6 neutrons. 11 protons, 6 electrons, and 6 neutrons.

C) 5 protons, 5 electrons, and 6 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.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: