Mathematics, 05.03.2021 20:10, 125712

How many protons, neutrons and electrons are in an atom with an atomic 5 points number of 20 and an atomic mass of 40?*
20 protons, 20 electrons, 20 neutrons
20 protons, 20 electrons, 40 neutrons
20 protons, 10 electrons, 20 neutrons

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How many protons, neutrons and electrons are in an atom with an atomic 5 points number of 20 and an...