Rf

Rutherfordium · element 104

Transition Metal · Solid at room temperature

Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 267Rf, has a half-life of approximately 1.3 hours. In the periodic table of the elements, it is a d - block element and the second of the fourth - row transition elements.

  See Rutherfordium as a bubble   Play the Pop Quiz
Decay traces in a spark chamber, not of rutherfordium, but of a pion. This is a completely different, unrelated particle, but the decay of rutherfordium would make streaks there, too.
Decay traces in a spark chamber, not of rutherfordium, but of a pion. This is a completely different, unrelated particle, but the decay of rutherfordium would make streaks there, too. - Image © CERN, Chemical Elments A Virtual Museum under a Creative Commons Attribution 3.0 Unported License, source: https://images-of-elements.com/rutherfordium.php

Key facts

Atomic mass
267 u
how heavy one atom is
Phase (room temp.)
Solid
Density
23.2 g/cm³
how tightly packed it is
Melting point
2400 K (2127 °C)
when solid turns to liquid
Boiling point
5800 K (5527 °C)
when liquid turns to gas
Period
7
its row in the periodic table
Group
4
its column in the periodic table
Block
D-block
the neighbourhood it lives in
Electron configuration
[Rn] 5f14 6d2 7s2
where its electrons live
Shells
2 · 8 · 18 · 32 · 32 · 10 · 2
electrons in each layer, inside to out
Discovered by
Joint Institute for Nuclear Research
who found it

Source: Wikipedia

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