Modern inorganic chemistry

16

2500

>2000

o I500

1000

500

Hg .Rh

•Pb

10 20 30 40 50 60 70 80 90

Atomic number

Figure 1.6. First ionisation energies of the elements

CD
CO

2 34 56 78 9 10 i! 12 13 14 15 16 17 18 19 20

/7th ionisation

Figure 1.7. Successive ionisation energies for potassium