Chemical Famalies (Marshmellow Molecules)

Today we built our very own marshmellow version of a molecule.
This molecule was a crystal lattice structure which would simulate table salt (18NaCl)
Can you find an independent molecule within this structure? If not why?

What is the name of the numerical number that follows the atomic symbol?
When reading a chemical formula what does the number infornt of the molecule represent? What is its name?

HOMEWORK:

Complete todays crossword puzzle ( terminolgy review)
Complete Chapter 6 review on pg 224 - 225 # 1 -3, 5 - 8, 16, 20

Here is somethign just for fun!

JUST A GAME.... MICROLIFE!
http://www.brainbashers.com/gameloader/loader.asp?url=http%3A%2F%2Fwww%2Ebbc%2Eco%2Euk%2Fcbbc%2Fbluepeter%2Fgames%2Fmicrolife%2Fmicrolife%2Eshtml&title=Microlife&location=NOBB