Answer:
1 valence electron - group 1
4 valence electrons - group 14
8 valence electrons - group 18
3 valence electrons - group 13
Explanation:
Elements are placed in the periodic table according to the number of valence electrons in their outermost shell.
Hence, all elements in the same group have the same number of outermost shell electrons.
Group 1 elements have only one valence electron, group 14 elements have 4 valence electrons, group 13 elements have 3 valence electrons while group 18 elements have 8 valence electrons.