Exit presenter|Periodic Table Patterns and Combining Ratios
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Hook

Why does sodium chloride always have the same formula?

  • NaCl — not NaCl2 or Na2Cl5.
  • Pattern must come from atomic structure.
simplified layout — use Ptable for full tableGroup 1Group 2Group 17Similar valence behaviour within a group
Periodic table with groups 1, 2, and 17 highlighted