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                                                      DUPLET RULE                                  TWO ELECTRON IN LAST SHELL IS CALLED DUPLET  RULE.                                       e.g He has 2 electron in his last shell                             helium | Definition, Properties, Uses, & Facts | Britannica                                                                                               octed rule                                                     EIGHT ELECTRON IN LAST OR VELENCE SHELL IS CALLED OCTED RULE                            e.g ca                                                                                      calcium | Definition, Properties, & Compounds | Britannica

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