Atomic Structure
Q9.
(a) A stable atom contains 28 nucleons.
Write down a possible number of protons, neutrons and electrons contained in the atom.
(2 marks)
(b) An unstable isotope of uranium may split into a caesium nucleus, a rubidium nucleus and four neutrons in the following process.
![zz](../../../../graphics/symbols/nuclides/uranium236.png)
![z](../../../../graphics/symbols/nuclides/arrow.png)
![z](../../../../graphics/symbols/nuclides/caesium137.png)
![z](../../../../graphics/symbols/nuclides/plus.png)
![z](../../../../graphics/symbols/nuclides/rubidiumX.png)
![z](../../../../graphics/symbols/nuclides/plus.png)
![z](../../../../graphics/symbols/nuclides/4neutron.png)
(i) Explain what is meant by isotopes.
(ii) How many neutrons are there in the
nucleus?
(iii) Calculate the charge to mass ratio, in C kg–1, for the
nucleus.
(iv) Determine the value of X for the rubidium nucleus.
(6 marks)
(Total 8 marks)
![](../../../../graphics/buttons/Clickhereforsolution.png)