Welcome back to the chemistry lab… it’s our second delve into the world of atoms, electrons, neutrons and protons AKA Bob Marley, sound engineers, sad boys and parties!

This week Ron tries to introduce the concepts of Relative Charge and Relative Mass to a Laura that still can’t quite remember whether she’s talking about cells or atoms. Even if she could remember, the fact they both have nucleus’ apparently renders them both stupid and pointless anyway.

There’s also going to be maths. Gross, horrible, number filled maths… Laura tries to get her head around the sums that will let her know the average weight of an atom, and why isotopes are more than a baseball team.

What is an isotope? Will we find out? If we find out is there any chance of it staying in the swamp brain? Join the sciencey siblings for more arguing, baffling analogies and squabbling over who is paying attention.

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See you next week, when we’re back to the dreaded physics…