39 2 · 8 · 18 · 9 · 2

Yttrium, Y, element 39

Transition metal· Period 5· Group 3· d-block

Configuration [Kr]4d15s2

Atomic weight
88.9058Da
Phase
solid
Density
4.47g/cm³
Melting point
1,795.15K 1,522 °C
Boiling point
3,618.15K 3,345 °C
Electronegativity
1.22

Silvery-grey metallic element of group 3 on the periodic table. Found in uranium ores. The only natural isotope is Y-89, there are 14 other artificial isotopes. Chemically resembles the lanthanoids. Stable in the air below 400 degrees, celsius. Discovered in 1828 by Friedrich Wohler. 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 yttrium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
88.90584Da
Source: mendeleev
Electron configuration
[Kr]4d15s2
Source: mendeleev
Uncertainty of the atomic weight
2×10−5Da
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d15s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 9 · 2
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
1s0.824438.1756
2s10.377828.6222
2p3.996835.0032
3s15.448523.5515
3p15.907523.0925
3d13.602925.3971
4s24.736414.2636
4p26.254412.7456
4d23.041615.9584
5s32.7446.256