Question

the group number tells you how many valence electrons are in the _____.
outer shell/ valence shell
shells, all of them
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Explanation:

In chemistry (a subfield of Natural Science), the group number of an element in the periodic table indicates the number of valence electrons, which are located in the outermost (valence) shell. The option "shells, all of them" is incorrect because valence electrons are only in the outer shell, not all shells.

Answer:

outer shell/ valence shell