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For lithium to fluorine, the radii are 152, 111, 88, 77, 74, 66 and 64 pm, and the first ionisation…

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Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

For lithium to fluorine, the radii are $152$ , $111$ , $88$ , $77$ , $74$ , $66$ and $64$ pm, and the first ionisation enthalpies are $520$ , $899$ , $801$ , $1086$ , $1402$ , $1314$ and $1681$ kJ/mol. radius.corr(ie) gives $-0.86$ . Explain the sign, and say why the value is not exactly $-1$ .

Need a reminder? The key ideaShow

df.groupby("block")["ie"].mean() gives the mean of each block. df["a"].corr(df["b"]) gives the correlation $r$ , from $-1$ to $1$ . df.groupby("period")["ie"].diff() gives the change from the element before, inside each period; a negative value is a break in the rise.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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← Period 2 has two s-block elements, lithium (520) and beryllium (899), and six p-block elements…From gallium to krypton the first ionisation enthalpies are 579, 762, 947, 941, 1140 and 1351… →

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