Chlorophyll is a green pigment in plants and contains calcium

Haemoglobin is a red pigment of blood and contains iron

Cyanocobalamin is vitamin B₁₂ and contains cobalt

Carboxypeptidase−A is an enzyme and contains zinc

1, tetrahedral

2, tetrahedral

1, square planar

2, square planar

6

3

1

2

2.84

4.9

0

1.73

6 and 2

4 and 2

4 and 3

6 and 3