Determine the number of valence electrons the following atoms have and how many electron shells:
1. Lead (Pb)
2. Iodine (1)
3. Gallium (Ga)
4. Barium (Ba)
5. Rubidum (RD)
6. Antimony (Sb)
7. Krypton (Kn)
8. Selinium (Se)

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

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