54 - Xenon noble gas
Discovered by William Ramsay in 1898
Xenon is a chemical element with symbol Xe and atomic number 54. It is a colorless, dense, odorless noble gas, that occurs in the Earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized.
H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 18 | 2 in 4s + 6 in 4p + 10 in 4d |
| 5 | 8 | 2 in 5s + 6 in 5p |
colorless gas, exhibiting a blue glow when placed in a high voltage electric field Appearance
131 u Atomic Mass
165 K Boiling Point
18 Group
2, 4, 6 Common Oxidation States
1.4 Å Covalent Radius
0.00589 g/cm³ Density
−77 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 Electron Configuration
[Kr] 4d10 5s2 5p6 Electron Configuration (semantic)
54 Electrons
12.1 eV First Ionization Energy
1170.4, 2046.4, 3099.4 kJ/mol Ionization Energies
161 K Melting Point
5 Mendeleev Number
5 Number of Shells
8 Electron Valency
77 Neutrons
54 Atomic Number
31 Number of Isotopes
5 Period
Gas Phase
54 Protons
2, 8, 18, 18, 8 Electron Shell Occupations