Physics, 13.08.2021 16:30 ladybuggirl400

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of ? A
727272 protons, 178178178 neutrons, 106106106 electrons
B
727272 protons, 106106106 neutrons, 727272 electrons
C
178178178 protons, 250250250 neutrons, 727272 electrons
D
106106106 protons, 727272 neutrons, 106106106 electrons

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