Which of the following statements is TRUE? A. Elements in the same group have the same number of electron shells. B. Elements in the same period have the same number of valence electrons. C.Elements in the same period have similar characteristics, like reactivity and valence electrons. D. Elements in the same group, or family, have similar characteristics, like reactivity and valence electrons.

Physics · Middle School · Tue Nov 03 2020

Answered on

Here, option (B) is correct. 

Elements in the same period have the same number of valence electrons. A valence electron is an electron in the outer shell associated with an atom.