The metals with similar chemical properties are:

  • Barium
  • Beryllium
  • Radium
  • Calcium

All four are Group 2 elements (alkaline earth metals), which share the same number of valence electrons and therefore have similar typical oxidation state (+2) and reactivity patterns.

Rubidium (Group 1, alkali metal), titanium (transition metal), and platinum (noble metal) each belong to different groups and do not have similar chemical properties to the others listed.