alkaline-earth element
61Francium — radon ← francium → radium Cs ↑ Fr ↓ Uue …
62Protactinium — thorium ← protactinium → uranium Pr ↑ Pa ↓ …
63Rubidium — krypton ← rubidium → strontium K ↑ Rb ↓ …
64Sulfur — This article is about the chemical element. For other uses, see Sulfur (disambiguation). phosphorus ← sulfur → chlorine …
65Copernicium — roentgenium ← copernicium → ununtrium Hg ↑ Cn …
66Chromium — This article is about the chemical element. For other uses, see Chromium (disambiguation). vanadium ← chromium → manganese ↑ Cr ↓ Mo …
67Mendelevium — fermium ← mendelevium → nobelium Tm ↑ Md ↓ (Upu) …
68Neptunium — uranium ← neptunium → plutonium Pm ↑ Np ↓ (Uqt) …
69Phosphorus — This article is about the chemical element. For other uses, see Phosphorus (disambiguation). silicon ← phosphorus → sulfur …
70Technetium — molybdenum ← technetium → ruthenium Mn ↑ Tc ↓ Re …
