what chemical group is unstable and radioactive
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- The Atom R adioactivity is a part of nature. Everything is made of atoms. Radioactiveatoms are unstable; that is, they have toomuch energy. When radioactive atoms spon-taneously release their extra energy, they aresaid to decay. All radioactive atoms decayeventually, though they do not all decay at thesame rate.
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- - Found in the second column. Halogen Gases. - Non metal and highly reactive. - Flourine is the most reactive and Iodine is the least. Noble Gases. - Most stable and unreactive elements in the periodic table. - Some (argon and neon) are used in light fixtures and glow in distinctive colours.
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Radionuclide A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is an atom that has excess nuclear energy, making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferred to one of its electrons to release it as a conversion electron; or used to create and emit a new particle (alpha particle or beta particle) from the nucleus.
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Climate of Sydney The Bureau of Meteorology has reported that 2002 through 2005 were the warmest summers in Sydney since records began in 1859. 2004 saw an average daily maximum temperature of 23.4 °C (74.1 °F), 2005 of 23.4 °C (74.1 °F), 2002 of 22.9 °C (73.2 °F), and 2003 of 22.7 °C (72.9 °F).
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Radioactive Element Radioactive Element. a chemical element whose isotopes are all radioactive. The class of radioactive elements ineludes. technetium (atomic number 43), promethium (61), polonium (84), and all the elements that follow it in the Mendeleev periodic system (see Figure 1). By 1975, 25 radioactive elements were known.adioactive Element. a chemical element whose isotopes are all radioactive. The class of radioactive elements ineludes. technetium (atomic number 43), promethium (61), polonium (84), and all the elements that follow it in the Mendeleev periodic system (see Figure 1). By 1975, 25 radioactive elements were known.
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What are radioactive isotopes? When an unstable nucleus of a radioactive isotope spontaneously  decays, the radioactive decay process is normally gamma radiation,  beta particle or alpha particle emission … .his is called Carbon12.   Carbon14 with 6 protons and 8 neutrons, is unstable and decays by releasing a beta particle from its nucleus to become a stable isotope, Nitrogen14. which has 7 protons and 7 neutrons. That refers to an isotope that is unstable-the atoms will decay after a while.
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- About the Group. Group 17 is a family of elements known as the halogens. The word halogen means salt-former.. The halogens form salts when they react with a metal. Halogens exist in a variety of states at room temperature. Fluorine and chlorine are gases, bromine is a liquid, and iodine and astatine are solids.
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Radioactive Series a group of genetically related radioisotopes in which each succeeding isotope is formed as a result of the alpha or beta decay of the preceding isotope. Each radioactive series has a parent isotope, which is the one with the longest half-life. Radioactive series end in stable isotopes. If a nucleus emits an alpha particle, its charge Z is reduced by 2 and its mass number A by 4. Upon emission of a beta particle, Z increases by 1, but A is unchanged.
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- Some isotopes are radioactive because their neutron/proton ratios are too large or too small. Explanation: The neutron/proton ratio (#n//p#) of a nucleus determines its stability. If #n//p# is too large or too small, the nucleus is unstable. It decays to form a more stable nucleus. The greater #n//p# value of carbon-14 is too large for a carbon atom. This makes the nucleus unstable.
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Chemical reaction Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur. The substance (or substances) initially involved in a chemical reaction are called reactants or reagents.
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Does thymine base pairs with adenine in RNA? In RNA, the nitrogenous bases change and there is no longer Thymine, instead Uracil replaces Thymine but it bonds with the same base pair (Adenine) as it would in DNA. In oth … er words DNA base pairs are: Adenine-Thymine, Guanine-Cytosine. RNA base pairs are: Adenine-Uracil, Guanine-Cytosine.
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What makes some isotopes have an unstable nuclei and others not? They are unstable because they can not hold together, they have too many or too few neutrons. The are called radio-isotopes. The disintegrate by emitting a particle or an atom into another element. The new element may be a radio-isotope too. I hope it's clear!!!
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Pseudohalogen  [show article only]hover over links in text for more info The halogens or halogen elements (/ˈhælədʒən, ˈheɪ-, -loʊ-, -ˌdʒɛn/) are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117 (ununseptium) may also be a halogen.
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Elements Astatine, At. Astatine is the only halogen (Group 7 or 17) element that is naturally radioactive. It is the largest of the group, so the radioactivity is due to the instability of the nucleus. Back to the beginning of Elements. Astatine, At. Astatine is the only halogen (Group 7 or 17) element that is naturally radioactive. It is the largest of the group, so the radioactivity is due to the instability of the nucleus.
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Radioactivity Radioactive decay occurs in unstable atomic nuclei – that is, ones that don’t have enough binding energy to hold the nucleus together due to an excess of either protons or neutrons. It comes in three main types – named alpha, beta and gamma for the first three letters of the Greek alphabet.Alpha decay.fter a nucleus undergoes alpha or beta decay, it is often left in an excited state with excess energy. Just as an electron can move to a lower energy state by emitting a photon somewhere in the ultraviolet to infrared range, an atomic nucleus loses energy by emitting a gamma ray.
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Radioactivity Radioactive decay occurs in unstable atomic nuclei – that is, ones that don’t have enough binding energy to hold the nucleus together due to an excess of either protons or neutrons.It comes in three main types – named alpha, beta and gamma for the first three letters of the Greek alphabet. - emission occurs by the transformation of one of the nucleus’s neutrons into a proton, an electron and an antineutrino. Byproducts of fission from nuclear reactors often undergo β - decay as they are likely to have an excess of neutrons.
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- RADIOACTIVITY. Radioactive nuclides tend to decay in a way that results in a daughter nuclide that lies closer to the line of stability. Due to this, it is possible to predict the type of decay that a nuclide will undergo based on its location relative to the line of stability on the Chart of the Nuclides.
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Sodium diuranate  [show article only]hover over links in text for more info A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weakly radioactive because all its isotopes are unstable (with half-lives of the six naturally known isotopes, uranium-233 to uranium-238, varying between 69 years and 4.5 billion years).
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Group 1: The Alkali Metals The alkali metals are the six metals of Group 1 in the Periodic Table – lithium, sodium, potassium, rubidium, ceasium (cesium) , and francium. Only lithium, sodium and potassium are safe enough to keep in the school lab.
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- The Halogens (Group 17) The halogens are a series of highly reactive, nonmetal elements from Group 17 of the periodic table. Learning Objectives Describe the general properties of the halogen elements.
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- 1 Alkaline earth metals. The alkaline earth metals make up group 2 of the periodic table, from Be through Ra. The alkaline earth metals have very high melting points and oxides that have basic alkaline solutions. Their characteristics are well described and consistent down the group.  Transition metals.
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Alkali metal The alkali metals, halogens and noble gases are three important groups in the periodic table. The alkali metals are soft, reactive metals. They react vigorously with water and become more reactive as you go down the group.The halogens are reactive non-metals.They become darker as you go down the group.he elements in group 1 are called the alkali metals. They belong to the left-hand column in the periodic table. They are very reactive and must be stored in oil to avoid contact with air or water.
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- Groups. A vertical column of elements in the periodic table is a group. The elements in a group have similar chemical properties to each other. For example, group 1 contains sodium and other very reactive metals, while group 7 contains chlorine and other very reactive non-metals.Group 0 (also known as group 8 or group 18) contains helium and other very unreactive non-metals.The modern periodic table. Note that you will never find a compound in the periodic table, because these consist of two or more different elements joined together by chemical bonds. Page: 1  1. 2  2. 3  3.roup 0 (also known as group 8 or group 18) contains helium and other very unreactive non-metals. The modern periodic table. Note that you will never find a compound in the periodic table, because these consist of two or more different elements joined together by chemical bonds. Page: 1  1. 2  2. 3  3.
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What Are Radioactive Substances? - Examples & Uses Radioactive substances produce three types of dangerous radiation: alpha particles are the nuclei of helium atoms. They move slowly, don't penetrate the skin, but can cause a lot of damage if swallowed.
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Bohrium It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours. In the periodic table of the elements, it is a d-block element and in the transactinide elements.It is a member of the 7th period and belongs to Group 5. Chemistry experiments have confirmed that dubnium behaves as the heavier homologue to tantalum in group 5.The chemical properties of dubnium are characterized only partly. They are similar to those of other group 5 elements.t is a member of the 7th period and belongs to Group 5. Chemistry experiments have confirmed that dubnium behaves as the heavier homologue to tantalum in group 5. The chemical properties of dubnium are characterized only partly. They are similar to those of other group 5 elements.
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- Atomic Number Atomic Mass Electron Configuration Number of Neutrons Melting Point Boiling Point Date of Discovery Crystal Structure. Element Groups: Alkali Metals Alkaline Earth Metals Transition Metals Other Metals Metalloids Non-Metals Halogens Noble Gases Rare Earth Elements Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page