Chemistry · Oct / Nov 2022 · Paper 11 · Question 5

The diagram shows the outer shell electrons of the atoms of two elements, Q and R. key × = an electron ○ = a nucleus The sulfate of Q is insoluble. Element R is gaseous at room temperature and pressure. Which row could be correct?

1. Aproton number of Q: 12, relative atomic mass of R: 35.5
2. Bproton number of Q: 12, relative atomic mass of R: 80
3. Cproton number of Q: 56, relative atomic mass of R: 80
4. Dproton number of Q: 56, relative atomic mass of R: 35.5

As printed in the paper