Elements in the same group have the same

Question

a
nuclear charge
b
atomic radius
c
number of valence electrons
d
energy level of outer electrons

Answer 1

Elements in the same group have the same number of valence electrons (c). This is a key characteristic of elements in the same group (or column) of the periodic table, as they exhibit similar chemical properties due to their having the same number of electrons in their outermost shell.