Elements in the same periodic table wich has the same number of valence electrons

Elements In the same group or family in the periodic table have the same number of valence electrons.

For example the halogens all have 7 valence electrons in their outermost electron shell.

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.

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