Which two elements represent the same family of the periodic table?

Hydrogen Helium Lithium Fluorine

Is it none??

3 answers

Your teacher probably wants Hydrogen and lithum, but frankly, Hydrogen as an element is not much like an alkaline metal, even though it is often placed in Group 1. When I was a tadpole, it was often placed in Group VII.
Okay, thank you
ITS NONE
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