Which of the two elements below have similar properties?
Chlorine (CI) and Zinc (Zn)
Sodium (Na) and Fluorine (F)
Potassium (K) and Francium (Fr)
Magnesium (Mg) and Helium (He)

Which of the two elements below have similar properties Chlorine CI and Zinc Zn Sodium Na and Fluorine F Potassium K and Francium Fr Magnesium Mg and Helium He class=