Be

Mg

Ca

Sr

Ba

Occurence %

6x10-4

2.1

3.6

0.02

0.03

Ionisation

895

734

587

541

500

energy
2
1746

1443

1059

959

~900

/ kJxmol-1

3
14000

9700

4930

4170

3580

Hydration-

-2994

-1924

-1580

-1485

-1276

enthalpy/kJxmol-1

Eo/V

-1.85

-2.37

-2.87

-2.87

-2.9

Ionic radius (r/Å)

0.31

0.65

0.99

1.13

1.35

Ion potential (q/r)

6.45

3.08

2.02

1.77

1.48

Ion mobility

4.8

5.5

6.2

6.2

6.6

/108m2s-1V-1

Melting point/0C

1278

651

850

770

704

Atomic radius /Å

1.11

1.6

1.97

2.15

2.17

pLM(OH)2

-

11

4.2

3.3

1.5

pL MCO3

5

8.3

9

8.3

pL MC2O4

4.1

8.7

7.2

7

pL MSO4

~0

5

6.5

10

logK MF+

4.95

1.82

0.63

0.15

-0.2

logK MEDTA

8.7

10.7

8.8

7.9

logK Mgly+

3.4

1.4

0.9

0.8

logK MP2O72-

5.8

5

4.7

logK MATP

4.2

4

3.5

3.3

C(plasma) /ppm

<4x10-7

2.2

100

4x10-2

~10-2

C(erythrocyte)/ppm

<10-4

61

6.5

4x10-2

~10-2