Search results
Results From The WOW.Com Content Network
The chemistry of scandium is almost completely dominated by the trivalent ion, Sc 3+, due to its electron configuration, [Ar] 3d 1 4s 2. The radii of M 3+ ions in the table below indicate that the chemical properties of scandium ions have more in common with yttrium ions than with aluminium ions. In part because of this similarity, scandium is ...
Sc 2 O 3 + 6HF → 2ScF 3 + 3H 2 O; 2ScF 3 + 3Ca → 3CaF 2 + 2Sc; Madagascar and the Iveland-Evje region in Norway have the only deposits of minerals with high scandium content, thortveitite (Sc,Y) 2 (Si 2 O 7), but these are not being exploited. [30] The mineral kolbeckite ScPO 4 ·2H 2 O has a very high scandium content but is not available ...
Atomic number (Z): 21: Group: group 3: Period: period 4: Block d-block Electron configuration [] 3d 1 4sElectrons per shell: 2, 8, 9, 2: Physical properties; Phase at ...
half-life (t 1/2) mode product; 44m2 Sc ... ACTION: A nucleus emits two electrons and two antineutrinos. QID: double beta minus decay (Q18907407) • in NUBASE2020.
Gadolinium isotopes have four metastable isomers, with the most stable being 143m Gd (t 1/2 = 110 seconds), 145m Gd (t 1/2 = 85 seconds) and 141m Gd (t 1/2 = 24.5 seconds). The isotopes with atomic masses lower than the most abundant stable isotope, 158 Gd, primarily decay by electron capture to isotopes of europium .
However there are numerous exceptions; for example the lightest exception is chromium, which would be predicted to have the configuration 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 4s 2, written as [Ar] 3d 4 4s 2, but whose actual configuration given in the table below is [Ar] 3d 5 4s 1.
Scandium concentrates in the liver and is a threat to it; some of its compounds are possibly carcinogenic, even though in general scandium is not toxic. [80] Scandium is known to have reached the food chain, but in trace amounts only; a typical human takes in less than 0.1 micrograms per day. [80]
This element also has 13 meta states with the most stable being 44m2 Sc (t 1/2 58.6 h). The isotopes of scandium range from 37 Sc to 62 Sc. The primary decay mode at masses lower than the only stable isotope, 45 Sc, is beta-plus or electron capture , and the primary mode at masses above it is beta-minus.