Naturally occurring neodymium (60Nd) is composed of 5 stable isotopes, 142Nd, 143Nd, 145Nd, 146Nd and 148Nd, with 142Nd being the most abundant (27.2% natural abundance), and 2 long-lived radioisotopes, 144Nd and 150Nd.
Is neodymium stable or unstable?
The metal has a bright and silvery luster. Neodymium can be found in two allotropic forms, transforming from a double hexagonal to a body-centered cubic. Naturally-occurring neodymium has seven stable isotopes. Fourteen other radioactive isotopes are known.
Is isotope FR 147 stable?
Like all artificial elements, it has no stable isotopes. It was first synthesized in 1945. Thirty-eight radioisotopes have been characterized, with the most stable being 145Pm with a half-life of 17.7 years, 146Pm with a half-life of 5.53 years, and 147Pm with a half-life of 2.6234 years.
Is lanthanum 140 stable?
There are 38 radioisotopes that have been characterized, with the most stable being 138La, with a half-life of 1.02×1011 years; 137La, with a half-life of 60,000 years and 140La, with a half-life of 1.6781 days.
Is samarium 145 stable?
Other than the naturally occurring isotopes, the longest-lived radioisotopes are 151Sm, which has a half-life of 88.8 years, and 145Sm, which has a half-life of 340 days. The stable fission product 149Sm is also a neutron poison.
Why are sharks scared of some rare earth metals? Movement of elements produces an electric current between the metal and the shark fin. It is where super large elements can be both stable and useful.
Is neodymium harmful to humans?
The amount of neodymium in humans is quite small and, although the metal has no biological role, it can be effects on parts of the body: neodymium dust and salts are very irritating to the eyes. Ingested neodymium salts are regarded as only slightly toxic if they are soluble and non toxic if they are insoluble.
Is TM radioactive?
It is fairly soft and slowly tarnishes in air. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices, and in some solid-state lasers .ThuliumAppearancesilvery grayStandard atomic weight Ar, std(Tm)168.934218(6)Thulium in the periodic table47 more rows
Which field is the chosen isotope most useful?
Radioactive isotopes have many useful applications. In particular, they are central to the fields of nuclear medicine and radiotherapy. In nuclear medicine, tracer radioisotopes may be taken orally or be injected or inhaled into the body.
What are 3 uses for lanthanum?
Lanthanum and other rare-earth compounds are used in carbon arc lighting, specifically in the film and television industry for studio lighting and projection. Lanthanum oxide (La2O3), also called lanthana, improves the alkali resistance of glass and is used in making camera lenses and in other special glasses.
lanthanum (La), chemical element, a rare-earth metal of Group 3 of the periodic table, that is the prototype of the lanthanide series of elements. Lanthanum is a ductile and malleable silvery white metal that is soft enough to be cut with a knife.
What scent do sharks hate?
rotting shark carcasses As reported by Discovery Channel, the first significant discovery was that sharks hate the smell of rotting shark carcasses and quickly swim away from the scent.
Is it bad to have magnets near your body?
Yes and No. Generally speaking, magnets below 3000 Gauss (magnetic field unit) are basically harmless to the human body, while magnets with magnetic field strength above 3000 Gauss are harmful to the human body. Although some magnets are harmful to humans, this negative effect is also negligible.
Is it bad to put a magnet near your heart?
Because blood conducts electricity, its flow through the very powerful magnetic field generates a current. But there seems to be no indication of any damage to the heart.
Is thulium man made?
Thulium is a lanthanide element, it has a bright silvery-gray luster and can be cut by a knife. Naturally occurring thulium is made entirely of the stable isotope Tm-169.
What is the meaning of atomic number 69?
Thulium Thulium is a chemical element with the symbol Tm and atomic number 69. It is the thirteenth and third-last element in the lanthanide series. A relatively pure sample of thulium metal was first obtained in 1911.
What are 3 uses of radioisotopes?
Different chemical forms are used for brain, bone, liver, spleen and kidney imaging and also for blood flow studies. Used to locate leaks in industrial pipe lines…and in oil well studies. Used in nuclear medicine for nuclear cardiology and tumor detection. Used to study bone formation and metabolism.
Why are alpha emitters not used as diagnostic tools? Alpha particles initiate ionization of water and dont leave body.
Who named lanthanum?
Carl Gustav Mosander Periodic Table appDiscovery date1839Discovered byCarl Gustav MosanderOrigin of the nameThe name is derived from the Greek lanthanein, meaning to lie hidden.Allotropes