Elements
88

Ra

Radium

Radium (Ra) is a silvery-white colored metal that has the atomic number 88 in the periodic table. It is an Alkaline earth Metal with the symbol Ra and is located in Group 2 of the periodic table.

Radium was discovered by Pierre and Marie Curie in 1898 in the ore Pitchblende after their discovery of polonium in the same ore. It is a solid metal at room temperature and it has a melting point of 700°c and a boiling point of 1140°c. Radium is a radioactive element an will decay quickly. It glows in the dark and also some of its compounds will as well. Radium is sometimes used in the production of glow in the dark paints but due to its toxicity is no longer used. Radium is not present in its elemental form in the earths crust but instead found in uranium deposits and in sea water. Radium compounds produce alpha, beta and gamma rays making them dangerous to humans.

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FAQ's

What is the Melting Point for Radium?

Radium has a Melting Point of 700°F, meaning at 700°F it will turn to a liquid.

What is the Boiling Point for Radium?

Radium has a Boiling Point of 1737°F, meaning at 1737°F it will turn to a Gas.

What is the Electronegativity of Radium?

Radium's Electronegativty is 0.9. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Radium?

Radium has a Heat of Vaporization of kJ/mol.

Uses

Used in treating cancer because of the gamma rays it gives off.

Sources

Found in uranium ores at 1 part per 3 million parts uranium.

88
Protons
88
Electrons
138
Neutrons

Ra

Element Symbol
Ra
Atomic Weight
226
Atomic Number
88
State
Solid
Melting Point
Unknown
700
°C
Boiling Point
1737
Unknown
°C
Heat of Vaporization
Unknown
kJ/mol
Crystal Structure
Cubic: Body centered
Thermoconductivity
0.186
Unknown
W/cmK
Shells
2,8,18,32,18,8,2
Group
Alkali Earth Metal
Period
7
Block
P Block
Orbitals
[Rn] 7s2
Coefficient of Thermal Expansion
8 10^-6 K^-1
Covalent Radius
--
Density at 293K
5 g/cm³
Electrical Conductivity
--
First Ionization Potential
5.2789 V
Second Ionization Potential
10.148 V
Third Ionization Potential
--
Ionic Radius
1.62 (+2) Å
Oxydation States
2
Lattice Parameter
--
Lattice Parameter 2
--
Lattice Parameter 3
3.238 Å
Pronounced

RAY-di-em

Discovered by

Pierre and Marie Curie

Discovery date

1898

Orbital configuration
2,8,18,32,18,8,2

Download the Periodic Table

Explore Other Alkali Earth Metals

137.327
56

Ba

Barium
24.305
12

Mg

Magnesium
87.62
38

Sr

Strontium
9.012
4

Be

Beryllium
40.078
20

Ca

Calcium
Alkaline earth metals is the second most reactive group of elements in the periodic table. They are found in group 2 of the periodic table (formally known as group IIA).
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