Expert: Walter Hintz - 10/2/2005

Question
Could you help me by defining the following terms?

electrical shell
Family of elements
Frictional ForcePhase of matter

Also, could you tell me what the chemical compositions are for lipids, nucleic Acids, and proteins, along with some examples for each?

Thanks

Answer
The electric shell is mostly likely referring to the position of the electrons in orbit.  

Certain elements are assigned a position on the periodic rable according to their common properties.  All of the metals for example.

I am not aware of this term

lipids are made up of C,H, and O.  They are combinations of fatty acids and glycerol.    Vegetable Oil is example

Nucleic are made up of a N compound, a ribose sugar and one or more phosphates.  ADP  for example

Proteins are made up of amino acids. Hemaglobin is an example