Answer:
Element Y and element Z
Step-by-step explanation:
One of the criteria for grouping the elements in the periodic table is according to their valence electrons.
If several elements have the same amount of valence electrons, they belong to the same group.
If they have the same configuration of valence electrons, then electronegativity, atomic radius, ionization energy, among others. It will be similar.
Element Y and element Z have the same number of valence electrons, then they will be located in the same group, and share similar periodic properties