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Posted by on Saturday, May 19, 2012 at 3:54am.

the mass number of an element is 18 it contains 7 electrons what is the number of protons and neutrons in it what is atomic number of an element.

  • chemistry - , Saturday, May 19, 2012 at 2:05pm

    It has a charge of zero? If so than it has 7 protons and 11 neutrons

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