#Id: 7744

#Unit 1. Structure and Function of Biomolecules

An ionic radius is one-half the distance between the nuclei of two ions in an ionic bond.

#Id: 7745

#Unit 1. Structure and Function of Biomolecules

The noble gases are left out of the trends in atomic radii because there is great debate over the experimental values of their atomic radii.

The SI units for measuring atomic radii are the nanometer (nm) and the picometer (pm). 1 nm = 1 X 109 m; 1 pm = 1 X 10-12 m.

#Id: 7746

#Unit 1. Structure and Function of Biomolecules

The noble gases are left out of the trends in atomic radii because there is great debate over the experimental values of their atomic radii.

The SI units for measuring atomic radii are the nanometer (nm) and the picometer (pm). 1 nm = 1 X 109 m; 1 pm = 1 X 10-12 m.

#Id: 7747

#Unit 1. Structure and Function of Biomolecules

Size of atom or atomic radii can be estimated by effective nuclear charge

#Id: 7748

#Unit 1. Structure and Function of Biomolecules

Zeff=Z –S

Chlorine would have a Z value of 17 (the atomic number of Chlorine). Continuing to use Chlorine as an example, the 10 inner electrons (S) would screen out the positive charge of ten protons. Therefore there would be and effective nuclear charge of 17-10 or +7.

#Id: 7749

#Unit 1. Structure and Function of Biomolecules