isoelectronic sequence

Isoelectronic sequence

A term used in spectroscopy to designate the set of spectra produced by different chemical elements ionized in such a way that their atoms or ions contain the same number of electrons. The sequence in the table is an example. Since the neutral atoms of these elements each contain Z electrons, removal of one electron from scandium, two from titanium, and so forth, yields a series of ions all of which have 20 electrons. Isoelectronic sequences are useful in predicting unknown spectra of ions belonging to a sequence in which other spectra are known. See Atomic structure and spectra

Example of isoelectronic sequence
Designation Emitting Atomic
of spectrum atom or ion number, Z
Cal Ca 20
Scll Sc+ 21
Tilll Ti2+ 22
VIV V3+ 23
CrV Cr4+ 24
MnVI Mn5+ 25

isoelectronic sequence

[¦ī·sō·i‚lek′trän·ik ′sē·kwəns]
(spectroscopy)
A set of spectra produced by different chemical elements ionized so that their atoms or ions contain the same number of electrons.
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