Solutions for Numbergrid Puzzles. Just find the unique puzzle id for the puzzle you're working on and enter it below to find the solution. For Numbergrid puzzles, the unique ID is a series of eight numbers and/or letters, and is printed below each individual puzzle in the PDF. (i.e. SFA8229A).
The chemical bonding that holds the atoms of a metal together. This bond is formed from the attraction between mobile electrons and fixed, positively charged metallic atoms.
Ionic Bonds. An ionic bond is a type of chemical bond that has formed as a result of the complete transfer of valence electrons from one molecule to another. Metals will transfer their valence electrons to non-metals forming a positively-charged ions. The atoms that accept the electrons become negatively-charged.