The atomic number is 11 and mass number is 23. It is a positively charged cation because protons exceed electrons by one. Its electronic configuration is 2, 8 and the species is a sodium ion, Na+.
If a species has 11 protons, 12 neutrons and 10 electrons then (i) what is its atomic number and mass number? (ii) is it neutral, a cation or an anion? Explain. (iii) write its electronic configuration. (iv) name the species.
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The atomic number is equal to 11 protons and the mass number equals 11 protons plus 12 neutrons, which is 23. It is a cation carrying a single positive charge because it contains 11 positive protons and only 10 negative electrons. Its 10 electrons are arranged with the electronic configuration 2, 8. Therefore, this chemical species is the sodium cation, represented as Na+.
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