Edexcel IAL Chemistry 2.17 Periodic ionisation-energy data

Label axes and units, select a linear scale that uses the grid, plot each point accurately and convert a logarithmic reading back to the requested energy value.

Exam points

Plot ionisation-energy data with labelled axes, units, scale and accurate points.
Use a log-ionisation graph to estimate and convert a missing energy value.
Identify periodic behaviour from repeating patterns in ionisation-energy data.

[Maximum number: 4]

This question is about the structure of atoms.

(a)

The log of the fourth ionisation energy for six elements is shown in the table.

Table for Question (a) — Edexcel A-Level Chemistry AS

Plot a graph of these data.
(3)

Figure for Question (a) — Edexcel A-Level Chemistry AS

[ 3 ]

(b)

Use your graph to estimate the fourth ionisation energy for sodium, in $\mathrm{kJ} \mathrm{mol}^{-1}$ .

[ 1 ]

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2.17—Represent data, in a graphical form (including the use of logarithms of first ionisation energies on a graph) for elements 1 question 1

Question (a)

Question (b)