ytterbium
Noun
Meaning
A rare element of the boron group, sometimes associated with yttrium or other related elements, as in euxenite and gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium.
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Chemistry experiments have confirmed that nobelium behaves as a heavier homolog to ytterbium in the periodic table.
Finely dispersed ytterbium readily oxidizes in air and under oxygen.
Isotopes lighter than the stable lutetium-175 decay via electron capture (to produce isotopes of ytterbium ), with some alpha and positron emission ; the heavier isotopes decay primarily via beta decay, producing hafnium isotopes.
Erbium and ytterbium ions are common active species in such lasers.
Europium and ytterbium form salt-like monoxides, EuO and YbO, which have a rock salt structure.
Greenwood & Earnshaw, p. 27 The electrons in the 4f-subshell, which is progressively filled from cerium (element 58) to ytterbium (element 70), are not particularly effective at shielding the increasing nuclear charge from the sub-shells further out.