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In which year Rubidium was discovered?
In which year Scandium was discovered?
In which year Sodium was discovered?
In which year Strontium was discovered?
In which year Titanium was discovered?
In which year Yttrium was discovered?
In which year Zirconium was discovered?
Into how many blocks are the Elements divided in the Periodic Table?
Into how many parts can a Solids (Crystals) be classified?
Into how many parts is the System classified?