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Chemistry counting atoms in compounds. Bromine has two isotopes, 79 br and 81 br, whose masses. 13 12 here are three isotopes of an element: Scanned from a xerox multifunction printer.pdf created date: Web worksheet isotopes atomic ions isotope atoms worksheets atom chessmuseum counting gingras protons electrons compounds briefencounters neutrons ninth problems. Web the answer is (b) law of conservation of mass. They have the same number of protons and electrons as the element but different mass numbers and number. Chemistry counting atoms in compounds. Web here are three isotopes of an element: Live worksheets > english > chemistry > ions > ion and charged isotope practice. Isotopes are versions of the same element.