Ba

Barium · element 56

Alkaline Earth Metal · Solid at room temperature

Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Because of its high chemical reactivity barium is never found in nature as a free element.

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1.5 Grams Barium with a Grey Oxide Layer under Argon. Original size in cm: 0.7 x 1
1.5 Grams Barium with a Grey Oxide Layer under Argon. Original size in cm: 0.7 x 1 - 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/barium.php

Key facts

Atomic mass
137.3277 u
how heavy one atom is
Phase (room temp.)
Solid
Density
3.51 g/cm³
how tightly packed it is
Melting point
1000 K (727 °C)
when solid turns to liquid
Boiling point
2118 K (1845 °C)
when liquid turns to gas
Period
6
its row in the periodic table
Group
2
its column in the periodic table
Block
S-block
the neighbourhood it lives in
Electronegativity
0.89
how strongly it pulls electrons
Electron configuration
[Xe] 6s2
where its electrons live
Shells
2 · 8 · 18 · 18 · 8 · 2
electrons in each layer, inside to out
Discovered by
Carl Wilhelm Scheele
who found it

Source: Wikipedia

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