And also what is an electron configuration for an atom of chlorine in the excited state?What two particles make up most of the mass of a hydrogen-2 atom?
The nucleus of Hydrogen-2 (Deuterium) is one proton and one neutron. They make up well over 99% of the mass of the atom.What two particles make up most of the mass of a hydrogen-2 atom?
For every atom, the protons and neutrons make up the mass of the atom. This is because electrons are so minute compared to the the protons and neutrons (1/2000th of the size) that they do not have any effect on the mass of an atom.
That question you could have easily found under google, or in your textbook.
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