CHEMISTRY 5070 · STRUCTURED PRACTICE
1
Magnesium exists naturally as three isotopes: , , and . The mass spectrum chart shows their relative abundances: (78.9%), (10.0%), and (11.1%).
(a)
[3]State the number of protons, neutrons, and electrons present in a ion.
(b)
[3]Calculate the relative atomic mass, Ar, of Magnesium to two decimal places. Show your working clearly.
(c)
[2]Explain why and have identical chemical properties.
(d)
[2]State the electronic configuration of a atom and a ion.
Total: 10 marks