Chemistry 9701 · AS & A Level · The Periodic Table: chemical periodicity
The Periodic Table: chemical periodicity — practice question
Using the atomic number, nucleon number and charge, the composition of atoms and ions can be worked out.
(a)[2]
Complete the table below.
(b)
Naturally occurring boron is a mixture made up of two stable isotopes, $^{10}\text{B}$ and $^{11}\text{B}$. Their relative isotopic masses and percentage abundances are given.
(b(i))[2]
Define clearly the term relative isotopic mass.
(b(ii))[2]
Calculate the relative isotopic mass of $^{11}\text{B}$. Give your answer to six significant figures and show your working.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Atomic number = $3$; nucleon number = $6$; protons = $3$; neutrons = $3$” …