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Compare Sodium vs Francium

Comparing Sodium (Na) and Francium (Fr). Atomic numbers 11 and 87 with atomic masses 22.99 u and 223 u, classified as alkali metal and alkali metal. Below: a side-by-side comparison of their physical, atomic, electron-configuration and historical properties, including density, melting and boiling points, ionization energies, oxidation states and discovery history.

vs
Na
Sodium
#11
Fr
Francium
#87

Periodic properties of the elements

SodiumFrancium
SymbolNaFr
Atomic number1187
Group11
Period37
Blockss
Element categoryAlkali MetalAlkali Metal

Physical properties

SodiumFrancium
Phase at STPSolidSolid
Density0.968 g/cm31.87 g/cm3
Atomic weight22.9898 u223 u
Melting point370.944 K
97.794 °C
208.0292 °F		300 K
26.85 °C
80.33 °F
Boiling point1156.09 K
882.94 °C
1621.292 °F		950 K
676.85 °C
1250.33 °F

Atomic properties

SodiumFrancium
Electronegativity (Pauling Scale)0.930.79
Electron affinity52.867 kJ/mol46.89 kJ/mol
Oxidation states−1, +1
(a strongly basic oxide)		+1
(a strongly basic oxide)
Ionization energies
  1. 495.8 kJ/mol
  2. 4562 kJ/mol
  3. 6910.3 kJ/mol
  4. 9543 kJ/mol
  5. 13354 kJ/mol
  6. 16613 kJ/mol
  7. 20117 kJ/mol
  8. 25496 kJ/mol
  9. 28932 kJ/mol
  10. 141362 kJ/mol
  11. 159076 kJ/mol
  1. 380 kJ/mol

Electron configuration

SodiumFrancium
Shorthand configuration[Ne] 3s1 [Rn] 7s1
Full configuration1s2 2s2 2p6 3s1 1s2 2s2 2p6 3s2 3p6 3d10 4s24p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s1
Electrons per shell2, 8, 12, 8, 18, 32, 18, 8, 1

History

SodiumFrancium
DiscoveryHumphry Davy (1807)Marguerite Perey (1939)
First isolationHumphry Davy (1807)Marguerite Perey (1939)
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