What is duet rule?

atoms either loose or gain a maximum of 2 valence electrons like hydrogen

You probably mean the octet rule, which states that atoms undergo chemical bonding in order to achieve an octet (8) of electrons in their valence shell. This makes them stable. All of the main group...

yes rules can be rules

The octet rule is a simple rule of thumb that states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electron configuration...

well if the #1 rule is no rule then that means they're no rules so that rule wouldn't be a rule so that mean that thy're are no rules. so no.