Tc

Technetium · element 43

Transition Metal · Solid at room temperature

Technetium (/tɛkˈniːʃiəm/) is a chemical element with symbol Tc and atomic number 43. It is the element with the lowest atomic number in the periodic table that has no stable isotopes:every form of it is radioactive. Nearly all technetium is produced synthetically, and only minute amounts are found in nature.

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Technetium Sample inside a sealed glass ampoule, filled with argon gas. 6x1 mm goldfoil covered with 99Tc powder (electroplated).
Technetium Sample inside a sealed glass ampoule, filled with argon gas. 6x1 mm goldfoil covered with 99Tc powder (electroplated). - GFDL, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

Key facts

Atomic mass
98 u
how heavy one atom is
Phase (room temp.)
Solid
Density
11 g/cm³
how tightly packed it is
Melting point
2430 K (2157 °C)
when solid turns to liquid
Boiling point
4538 K (4265 °C)
when liquid turns to gas
Period
5
its row in the periodic table
Group
7
its column in the periodic table
Block
D-block
the neighbourhood it lives in
Electronegativity
1.9
how strongly it pulls electrons
Electron configuration
[Kr] 4d5 5s2
where its electrons live
Shells
2 · 8 · 18 · 13 · 2
electrons in each layer, inside to out
Discovered by
Emilio Segrè
who found it
Appearance
shiny gray metal
what it looks like

Source: Wikipedia

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