52 2 · 8 · 18 · 18 · 6

Tellurium, Te, element 52

Metalloid· Period 5· Group 16· p-block

Configuration [Kr]4d105s25p4

Atomic weight
127.6Da
Phase
solid
Density
6.232g/cm³
Melting point
722.66K 449.51 °C
Boiling point
1,261.15K 988 °C
Electronegativity
2.1

Silvery metalloid element of group 16. Eight natural isotopes, nine radioactive isotopes. Used in semiconductors and to a degree in some steels. Chemistry is similar to Sulphur. Discovered in 1782 by Franz Miller. Description from mendeleev.

Back to the table
The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

5 of 5 fields have a value for tellurium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
127.6Da
Source: mendeleev
Electron configuration
[Kr]4d105s25p4
Source: mendeleev
Uncertainty of the atomic weight
0.03Da
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d105s25p4
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 18 · 6
Source: Worked outfrom electron configuration

Screening of each subshell

Clementi's screening constants: how much of the nucleus's charge the other electrons hide from an electron in each subshell. What is left is the effective nuclear charge it feels.

SubshellScreening σEffective charge Z − σ
1s1.043250.9568
2s13.668838.3312
2p4.1447.86
3s18.001933.9981
3p17.991134.0089
3d14.160737.8393
4s27.591624.4084
4p28.87823.122
4d32.0419.96
5s39.46212.538
5p41.191510.8085