cerium
Noun
Meaning
A rare metallic element, occurring in the minerals cerite, allanite, monazite, etc. Symbol Ce. Atomic weight 141.5. It resembles iron in color and luster, but is soft, and both malleable and ductile. It tarnishes readily in the air.
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Cells treated with just cerium had decreases in cell viability, but cells treated with both cerium and transferrin had more significant inhibition for cellular activity.
Element substitution for the calcium cation often includes certain rare earth elements (REE), such as yttrium and cerium.
If cerium is the dominant lanthanide, then it is converted from cerium(III) to cerium(IV) and then precipitated.
In the periodic table, it appears to the right of the alkaline earth metal barium and to the left of the lanthanide cerium.
Lanthanide oxides: clockwise from top center: praseodymium, cerium, lanthanum, neodymium, samarium and gadolinium.
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.