Chemistry 5070 · O Level · Atomic structure and the Periodic Table

Atomic structure and the Periodic Table — practice question

The diagram displays the outer-shell electrons of the atoms of two elements, Q and R. The sulfate of Q does not dissolve in water. Element R is a gas at room temperature and pressure. Which row might be correct?

  • Aproton number of Q $=12$, relative atomic mass of R $=35.5$
  • Bproton number of Q $=12$, relative atomic mass of R $=80$
  • Cproton number of Q $=56$, relative atomic mass of R $=80$
  • Dproton number of Q $=56$, relative atomic mass of R $=35.5$

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