How Strontium Is A Chemical Element With Symbol Sr And Atomic Number

Thorium is naturally a radioactive chemical element, which was discovered in 1828 from the Norwegian mineralogist Morten Thrane Esmark, and named Thor from Jons Jakob Bezelius, which means the “Norse God of Thunder.” Thorium is the most abundant metal found in earth crust and had been scattered million years ago in the galaxy, with the explosion of meteors known as supernova. Thorium generates radioactive gas products, as radon-20 decay. Other decay by-products of thorium are radium and actinium. But, thorium is found in nature as thorium-232, which has a half-life and endures under alpha decay. Thorium decay produces a significant amount of internal heat energy. Thorium is found in the same amount as lead, and four

The pioneering work of Becquerel in 1896 (the discovery of uranium), and the Curies (who subsequently discovered radium and polonium and the energy and heat given off by these new elements which they called radioactivity) led to the remarkable work of Ernest Rutherford. He was a physicist, whose experiments showed that some heavier elements spontaneously changed or decayed into lighter elements (unstable 'parent' elements giving off protons and neutrons to form a 'daughter' element) through the process of radioactivity. He discovered that radioactive materials decay at a very predictable rate, and that lead was the final decay product of uranium. Using Rutherford's ideas, Bertram Boltwood pioneered a method of radiometric dating in 1907. He hypothesized that since he knew how long it takes uranium to break down, he could measure the proportions of lead in uranium ores, and use his calculations to date how long those ores had existed,

Nuclear waste is a by-product of the uranium enrichment process and the operation of nuclear power plants. One of the most common radioactive isotopes found in nuclear waste is plutonium-239, which is capable of causing cancer-related fatalities for millions of people in very small amounts. Other isotopes include iodine-129, cesium-137, and uranium-238, all of which are highly radioactive and have half-lives in the tens of

Technetium -99m is produced by bombarding molybdenum 98 with neutrons. The result is 99Mo decaying with a half-life of 66 hours to the metastable state of Technetium 99m. This process gives off gamma

The periodic table is a table that categorises and displays all of the chemical elements. It is made up of groups, periods and blocks. A group (also referred to as a family) are the columns of elements, there are 8 groups. The elements in each family have similar but not identical properties and they all have the same number of outer electrons. E.g. lithium (Li), sodium (Na), potassium (K) are all soft, white, shiny metals because they are all members of group 1. A period is each horizontal row of elements, there are 7 periods. In a period, the elements are not alike in properties, the first element in a period is always an extremely active solid, and the last element in a period is always an inactive gas. Properties change greatly across a given row. Each new period represents the next shell which electrons fill. A block is a region of the periodic, there are 4 blocks: S, D, P and F.

This data is important for two reasons: determining who has had the most frequent exposure, and the most likely location of the Strontium-90.

Technetium -99m is produced by bombarding molybdenum 98Mo with neutrons. The resultant 99Mo decays with a half-life of 66 hours to the metastable state of Tc. This process permits the production of 99mTc for medical purposes. Since 99Mo is a fission product of 235U fission, it can be separated from the other fission products and used to generate 99mTc. For medical purposes, the 99mTc is used in the form of

Uranium, element number 92 on the periodic table, was used in the atomic bomb used in the attack of Hiroshima. Plutonium, the 94th element, was used the second bombing of Nagasaki. Uranium's atoms are unusually

Our world, as complex as it is, can be broken down into just 118 different elements. Some of these elements are well known and their names bring vivid images to mind, such as gold, neon, and copper. Other elements, however, are much less recognized. In fact, many people have never even heard of them. Lanthanum is one of these unsung elements. Although, quite often, one may live his entire life without ever hearing of this element, lanthanum is practically everywhere. Far from being a “rare earth” metal, as its name implies, it can be found in many places, from the bones that make up the human form, to the vegetables that make their meals. (1)(4) This poster will tell the fascinating history of lanthanum, some of the physical properties that

Scientists at the Join Institute of Nuclear Research in Dubna, Russia and scientists at the Lawrence Livermore National Laboratory in California discovered element 117 or, tennessine, in 2010. With an atomic mass/weight of 294 making it the second heaviest element known to mankind behind element 118 or, Oganesson. Before being named tennessine by the International Union of Pure and Applied Chemistry (IUPAC) in 2016, tennessine had the place holder name of ununseptium, which means one-one-seven in Latin. Tennessine was created by fusing berkelium-249 atoms with calcium ions until tennessine atoms formed. Since tennessine is radioactive, it has zero stable isotopes. Tennessine’s most stable isotope, however, is tennessine, which has a half-life of about 80 milliseconds. Only six atoms of tennessine have been artificially created to this day.

One of the many deadly radioisotopes released includes Iodine-131. Iodine-131 has a half life of 8 days (the radioisotope functions for 8 days). Iodine-131 contaminates the water supply and the air (that we breathe). If one were to ingest this radioisotope, it would incorporate into the thyroid and damage the tissue with beta and gamma radiation. This will lead to the full decay of the thyroid gland and surrounding tissue. This causes thyroid cancer (increases chance of cancerous cells forming by more than 70 percent), especially in children (those who are still growing). Strontium-90 is also released during a nuclear meltdown. Strontium-90 is released into the atmosphere, water supply, and surrounding plants and animals. Strontium-90 has a half life of 28 years but has a biological

Those different forms of the element are called isotopes. Each isotope has a half-life, for example if I bought 10 grams of an isotope whose half-life is 437 years. After the 437 years I would only have half the amount of what I bought. Americium has 12 isotopes which known are known to not be natural and are known to have a mass number between 232 and 247. The longest-lived isotopes of Americium are Americium 243 at a half-life of 7370 years, Americium 241 at a half-life of 432.2 years, and Americium 242 at a half-life 141 years. Even though Americium 243 and 241 are the most abundant of Americium’s isotopes, Americium 241 is the most

Important attributes of medical nuclear isotopes are their small half-lives. A half-life is the time it takes for half of a sample of an isotope to decay. Technetium—99, for example, has a six-hour half-life. Although short, this half-life allows enough time for testing. After this time period, the isotope will lose some of its radiation. The minute half-life allows very little time for any damage

Cobalt decays to form Nickel-60. As it decomposes, it releases gamma radiation. Beta particles also occur when Carbon-60 decays (4). The nuclear

Radioactivity is defined as “the spontaneous emission of particles”. (Nuclear Energy). Radioactivity is caused by an unbalanced nucleus in the cell. This happens because there is either an uneven number of protons and/or neutrons. When this happens, the element is considered to have multiple isotopes. An isotope is an atom with the same number of protons but a different number of neutrons. Thus, they have different atomic weights. This is important to know because there is a such thing as a radioactive isotope. These elements just have additional energy, and they release radiation in different forms. “There are over 800 radioactive isotopes, some of which are natural and some synthetic.” (Helmenstine). Radioactive elements can be both artificial and natural. However, in medicine, most of them are more than likely synthetic, since they are the most popular types.