Neutral aluminium-27 has 13 electrons and 14 neutrons. Bromide ion-80 has 36 electrons and 45 neutrons. Mercury-201 ion has 78 electrons and 121 neutrons. Neutrons equal mass number minus protons and electrons account for charges.
The species 27Al, 80Br- and 201Hg2+ have 13, 35 and 80 protons, respectively. How many electrons and neutrons do they have?
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For neutral 27Al, electrons equal protons giving 13 and neutrons equal 27 minus 13, which is 14. For 80Br-, gaining one electron gives 35 plus 1, which is 36 electrons and neutrons equal 80 minus 35, giving 45. For 201Hg2+, losing two electrons gives 80 minus 2, which is 78 electrons and neutrons equal 201 minus 80, which is 121.
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