n all elements in a group, the thing that is the same is the:

Question

a
Number of electrons in the valence shell
b
Number of electrons
c
Number of protons
d
Number of neutrons

Answer 1

In all elements in a group (the vertical columns of the periodic table), the thing that is the same is the:

a. Number of electrons in the valence shell.

Elements in the same group have similar chemical properties because they have the same number of electrons in their outermost (valence) shell, which determines how they interact with other elements.