A certain negative ion x^-2 has in its nucleus 18 neutron and 18 electron
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if the isotope has the charge -2 , it means that its number of electrons is higher than 2 compared to the number of protons. So the number of protons called also atomic number is 18-2=16=Z
the compound has 16 protons and 18 neutrons . Its mass is 16+18=34
it is the ions of S sulfur 34.
the compound has 16 protons and 18 neutrons . Its mass is 16+18=34
it is the ions of S sulfur 34.
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