When assigning priority to groups, atoms that are directly bonded to the carbon atom have their priority based upon their atomic number. |
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In such a case, an element's atomic number and atomic mass should be about equal. |
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To reach the band of stability starting with these elements, a process that decreases the atomic number is needed. |
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The existence of an element with an atomic number of 21 was predicted in 1869 by Dmitri Mendeleev. |
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As a result of the nucleon transformations, a new proton is left behind in the nucleus and the atomic number of the atom is raised by one. |
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The higher the atomic number, the more shells and electrons an atom will have. |
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Heavy metals are metallic elements that have a high atomic number and are poisonous to living organisms. |
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Atoms of an element that have the same atomic number but a different atomic weight are referred to as isotopes. |
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But barium has an atomic number of 56, barely more than half that of uranium. |
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Early in 1999 synthesis of the element with atomic number 114 was reported. |
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The transfermium elements are those elements with atomic numbers greater than 100, the atomic number for fermium. |
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Actinides are the elements above atomic number 89 and are usually radioactive. |
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Entries in Annex I are listed according to the atomic number of the element most characteristic of the substance's properties. |
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Element: Specific types of atoms that have the same number of protons in their nucleus and therefore have the same atomic number. |
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A quadrant design solid state backscattered electron detector is used for atomic number contrast imaging. |
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He discovered there was a systematic recurrence of those elements which had similar characteristics even though their atomic number increased. |
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Gamma decay does not generally affect the mass and atomic number of the radioisotope. |
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Following up on berkelium, dubnium and californium, researchers at the University of Berkely in California, stumbled upon am element with atomic number 117 about a year ago. |
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In a neutral atom, the number of electrons is equal to the number of protons, therefore, the atomic number also indicates the number of electrons in an atom. |
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In those cases in which the number of protons changes, the new nucleus has a different atomic number, and it therefore belongs to a different element. |
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Uranium, with atomic number 92, is the heaviest naturally occurring element. |
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With 111 protons and 161 neutrons, this lab-made element has the highest atomic number seen so far. |
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Both primary and secondary isotope effects decrease rapidly with increasing atomic number because the percentage difference in mass between isotopes tends to decrease. |
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The alpha emission from the Uranium nucleus decreases its atomic number by two and its atomic weight by four, converting it into radioactive 90Th234 Thorium. |
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Arsenic is a group V metalloid, with atomic number 33 and atomic weight 74.92. It occurs in several different forms depending upon the pH and oxidation potential of the water. |
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For aliphatic atoms, ak equals the atomic number. |
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The great importance of the atomic number derives from the observation that all atoms with the same atomic number have nearly, if not precisely, identical chemical properties. |
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Nuclei are distinguished by their mass and atomic number. |
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The atomic number increases by one, but the mass only decreases slightly. |
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This section should provide the appropriate mass densities and atomic number densities for materials used in the models of the packaging and contents. |
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When Mendeleev first put together the periodic table of the elements, he defined very clearly the order of the elements by arranging them in order by atomic number. |
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Edge effects may also occur where minerals containing elements of different atomic number are juxtaposed, resulting in a transition zone where the elements of both minerals are present. |
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It has the atomic number 22 and belongs to group 4 of the periodic table. |
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While normal concrete contains silicon as the main component with an atomic number of 14, calcium with an atomic number of 20 has a better shielding effect against gamma radiation. |
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Gold's atomic number of 79 makes it one of the higher atomic number elements that occur naturally. |
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Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. |
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The high number of isotopes is consistent with lead's atomic number being even. |
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Lead's high density, atomic number, and formability form the basis for use of lead as a barrier that absorbs sound, vibration, and radiation. |
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Plutonium is the element with the highest atomic number to occur in nature. |
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If silver were to lose two protons, it would have the same atomic number as which element? |
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On the basis of its atomic number, 106, that's exactly where seaborgium belongs. |
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The system will combine 9 MeV transmission imaging radiography with automatic identification of high atomic number materials such as tungsten, lead, uranium, or plutonium. |
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Atomic number 101 is a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles. |
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