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  • * [[Rubidium|Rb]] [[Strontium|Sr]] ([[Yttrium|Y]]) [[Zirconium|Zr]] ([[Niob|Nb]]) ([[Mol
    2 KB (308 words) - 22:11, 13 June 2021
  • Then there is the even less structurally useful rubidium (Rb) (also fifth row). <br>
    1 KB (190 words) - 22:28, 13 June 2021