A.) The reaction is Exothermic
It’s positive when you use energy for work
Mass number is the total number of protons and neutrons in the nucleus
<span>Out of the possible answers for this question, fluorine in the second period is correct. Of the four elements fluorine, chlorine, bromine and iodine, fluorine has the largest first ionization energy, with a Enthalpy number of 1681.0. Of all the elements, helium has the highest first ionization energy figure.</span>
