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Atomic structure

Oxygen has several isotopes, the most abundant being oxygen-16 ( $816O^{16}_{8}\text{O}$ ) and oxygen-18 ( $818O^{18}_{8}\text{O}$ ).

Which statement correctly describes the divalently charged anions $16O2−^{16}\text{O}^{2-}$ and $18O2−^{18}\text{O}^{2-}$ ?

Both ions have a total of 8 electrons and different specific charges.

Both ions have a total of 10 electrons, but the $16O2−^{16}\text{O}^{2-}$ ion has a greater specific charge than the $18O2−^{18}\text{O}^{2-}$ ion.

Both ions have the same number of neutrons but different numbers of electrons.

Both ions have the same specific charge because they carry the same net charge of $- 2 e$ .

Atomic structure Questions

77 exam-style questions on OCR GCSE Chemistry Atomic structure. Each one has a worked solution and a mark scheme showing where the marks go.

Atomic structure

Question bank

Oxygen has several isotopes, the most abundant being oxygen-16 ( $816O^{16}_{8}\text{O}$ ) and oxygen-18 ( $818O^{18}_{8}\text{O}$ ).

Which statement correctly describes the divalently charged anions $16O2−^{16}\text{O}^{2-}$ and $18O2−^{18}\text{O}^{2-}$ ?

Both ions have a total of 8 electrons and different specific charges.

Both ions have a total of 10 electrons, but the $16O2−^{16}\text{O}^{2-}$ ion has a greater specific charge than the $18O2−^{18}\text{O}^{2-}$ ion.

Both ions have the same number of neutrons but different numbers of electrons.

Both ions have the same specific charge because they carry the same net charge of $- 2 e$ .

77 exam-style questions on OCR GCSE Chemistry Atomic structure. Each one has a worked solution and a mark scheme showing where the marks go.