Ru

Ruthenium · element 44

Transition Metal · Solid at room temperature

Ruthenium is a chemical element with symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Like the other metals of the platinum group, ruthenium is inert to most other chemicals.

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Ruthenium Crystal, 0.6 grams, 0.6 x 1.3 cm size
Ruthenium Crystal, 0.6 grams, 0.6 x 1.3 cm size - Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/ruthenium.php

Key facts

Atomic mass
101.072 u
how heavy one atom is
Phase (room temp.)
Solid
Density
12.45 g/cm³
how tightly packed it is
Melting point
2607 K (2334 °C)
when solid turns to liquid
Boiling point
4423 K (4150 °C)
when liquid turns to gas
Period
5
its row in the periodic table
Group
8
its column in the periodic table
Block
D-block
the neighbourhood it lives in
Electronegativity
2.2
how strongly it pulls electrons
Electron configuration
[Kr] 4d7 5s1
where its electrons live
Shells
2 · 8 · 18 · 15 · 1
electrons in each layer, inside to out
Discovered by
Karl Ernst Claus
who found it
Appearance
silvery white metallic
what it looks like

Source: Wikipedia

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