Radioactive isotopes group 13 metals

EDTA forms 1 1 complexes with a large number of cations, including those of some of the main-group metals. The complex formed by calcium with EDTA is used to treat lead poisoning. When a solution containing the Ca-EDTA complex is given by injection, the calcium is displaced by lead. The more stable Pb-EDTA complex is eliminated in the urine. EDTA has also been used to remove radioactive isotopes of metals, notably plutonium, from body tissues. 

Symbol Co atomic number 27 atomic weight 58.933 a transtion metal, Group VIll (Group 9) element electron configuration [Ar]3d 4s2 valence +2 and +3 also valences 0, +1, +4, and +5 are known natural isotopes Co-59 (99.8%) and Co-57 (0.2%) radioactive isotope Co-60. 

Symbol Ni atomic number 28 atomic weight 58.693 a transition metal element in the first triad of Group VIll(Group 10) after iron and cobalt electron configuration [Ar]3d 4s2 valence states 0, -i-l, +2, and -f-3 most common oxidation state +2 the standard electrode potential, NF+ -1- 2e Ni -0.237 V atomic radius 1.24A ionic radius (NF+) 0.70A five natural isotopes Ni-58 (68.08%), Ni-60 (26.22%), Ni-61 (1.14%), Ni-62 (3.63%), Ni-64 (0.93%) nineteen radioactive isotopes are known in the mass range 51-57, 59, 63, 65-74 the longest-lived radioisotope Ni-59 has a half-life 7.6x10 years. 

Symbol Rb atomic number 37 atomic weight 85.468 a Group I (Group 1) alkali metal element electron configuration [Kr] 5si valence -i-l atomic radius 2.43A ionic radius, Rb+ 1.48A atomic volume 55.9 cc/g-atom at 20°C ionization potential 4.177 V standard electrode potential Rb+ + e Rb, E° = -2.98V two naturally-occurring isotopes, Rb-85 (72.165%) and Rb-87 (27.835%) Rb-87 radioactive, a beta emitter with a half-bfe 4.88xl0i° year twenty-seven artificial radioactive isotopes in the mass range 74—84, 86, 88-102. 

Symbol Na atomic number 11 atomic weight 22.9898 a Group lA (Group 1) alkali metal element electron configuration [NejSs valence +1 atomic radius 1.85A ionic radius, Na" in crystals 1.02A (for a coordination number 6) ionization potential 5.139 eV standard electrode potential, E°(Na+ + e Na) -2.71 V one naturally-occurring stable isotope, Na-23 (100%) sixteen artificial radioactive isotopes in the mass range 19-22, 24—35 longest-lived radioisotope, Na-22, ti/2 2.605 year shortest-lived isotope Na-35, ti/2 1.5 ms. 

CHROMIUM. [CAS 7440-47-3[. Chemical element, symbol Cr. at. nil. 24. at. wi. 51.996, periodic table group 6. mp 1837- 1877°C. bp 2672 C, density 7.2 g/cm. Elemental chromium has a body-centered cubic crystal structure The metal is silver-white with a slight gray-blue tinge, very hard (9.0 on the Mohs scale), capable of taking a brilliant polish, not appreciably ductile or malleable. The element is not aflected by air or HyO al ordinary temperatures, but when heated above 200°C, chromic oxide CryOt is formed. There tire four stable isotopes f0Cr. and, Cr through wCr. Fuur radioactive isotopes have been identihed, all with comparatively short half-lives 4 Cr. Jl,Cr. 1 Cr. and 5Cr, The element was first identified by Vauquelin in 1797. 

Nitrogen is a non-metallic element located in group 15 of the periodic table. It has two stable isotopes nitrogen-14, with an abundance of 99.634%, and nitrogen-15, with an abundance of 0.366%. At least five radioactive isotopes of the element have been prepared, with atomic weights of 12, 13, 16, 17, and 18. 

CAS 7440-48-4. Co. Metallic element of atomic number 27, group VIII of the periodic table. Aw 58.9332. Valences 2,3 no stable isotopes. There are several artificial radioactive isotopes, the most important being Co. Coordination number 4 (divalent), 6 (trivalent). 

CAS 7440-09-7. K. Metallic element of atomic number 19, group IA of the periodic table, an alkali metal, aw 39.098, valence of 1. Potassium-40 is a naturally occurring radioactive isotope. There are also two stable isotopes. The synthetic isotope, po-tassium-42, is used in tracer studies, primarily in medicine. An essential element in plant growth and in animal and human nutrition occurs in all soils. 

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