eka-tantalum
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Dubnium — rutherfordium ← dubnium → seaborgium Ta ↑ Db ↓ (Upp) … Wikipedia
Protactinium — thorium ← protactinium → uranium Pr ↑ Pa ↓ … Wikipedia
Isotopes of protactinium — Protactinium (Pa) Standard atomic mass: 231.03588(2) u The element has no stable isotopes. However, it has a characteristic terrestrial isotopic composition and thus an atomic mass can be given.Isotopes of protactinium occurring within the… … Wikipedia
dubnium — noun A transuranic chemical element (symbol Db) with atomic number 105. Syn: eka tantalum, hahnium, hassium, joliotium, nielsbohrium, unnilpentium … Wiktionary
Timeline of chemical elements discoveries — The discovery of the elements known to exist today is presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element,[clarification needed] as the exact date of discovery… … Wikipedia
Francium — radon ← francium → radium Cs ↑ Fr ↓ Uue … Wikipedia
Meitnerium — hassium ← meitnerium → darmstadtium Ir ↑ Mt ↓ (Upe) … Wikipedia
Ununoctium — ununseptium ← ununoctium → ununennium Rn ↑ Uuo ↓ (Uho) … Wikipedia
Kryptonite — This article is about Kryptonite, the element from the Superman mythos. For other uses, see Kryptonite (disambiguation). Kryptonite Lex Luthor in front of a display of kryptonite and holding green kryptonite. From a panel in Action Comics Annual… … Wikipedia
Neptunium — uranium ← neptunium → plutonium Pm ↑ Np ↓ (Uqt) … Wikipedia
