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An oxide ion, O2- has the same electrons configuration as an atom of which noble gas?

NYC Regents Chemistry Exam Jan 2023


40. An oxide ion, O2- has the same electrons configuration as an atom of which noble gas?

  1. Helium

  2. Neon

  3. Argon

  4. Krypton

Solution: O^2- has 2 extra electrons. Looking on the Periodic Table oxygen has an atomic number of 8 which means it has 8 electrons when neutral. 8+2= 10 electrons for oxygen 2- ion. Neon has an atomic number of 10 and 10 electrons when neural. Choice 2 is correct.

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