Dear reader‚ my original name is In Greek‚ Phosphoros‚ which means bringer of light‚ but I prefer to be called by my English name Phosphorus‚ but for easier reasons you can call me P. I am pretty much at the beginning of the periodic table‚ thanks to my atomic number of 15. Wonder what’s an atomic number? It is basically the number of protons‚ which is my positive charge‚ that I contain at my nucleus. The nucleus does not only contain protons‚ but also neutrons‚ which will be important to know of
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These natural isotopes are 63Cu and 65Cu. 63Cu and 65Cu are stable as well. 63Cu has 29 protons‚ 34 neutrons‚ and 29 electrons. 65Cu has 29 protons and 29 electrons as well‚ but 36 neutrons as opposed to 34. The other isotopes are radioactive‚ the most stable being 67Cu. The softness of copper partially explains its high electrical conductivity‚ as well as its thermal
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Atmospheric chemistry is a branch of atmospheric science in which the chemistry of the Earth’s atmosphere and that of other planets is studied. Environmental chemistry is the scientific study of the chemical and biochemical phenomena that occur in natural places. It can be defined as the study of the sources‚ reactions‚ transport‚ effects‚ and fates of chemical species in the air‚ soil‚ and water environments; and the effect of human activity on these. Environmental chemistry is an interdisciplinary
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protons and neutrons in the nucleus of an element and the atomic number is the number of protons that it has. 3) What is an isotope? Give an example (show how it is an isotope). a) An isotope is when two or more of the same element contains equal number of protons but different numbers of neutrons in the nucleus b) Uranium238 is the elemental form‚ Uranium 235 is an isotope 4) Compare and contrast the 3 basic types of chemical bonds and give an example of each. The three basic types of chemical
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particle accelerators. Neptunium and plutonium were the first transuranic elements to be synthesised in 1940 by Glenn Seaborg’s research team in the USA. Uranium 238 is bombarded with neutrons produced by the nuclear fission of U-235. Initially an isotope of uranium (U-239) forms which decays by beta emission to produce neptunium-239. Neptunium-239 decays by beta emission to produce Pu-239. 23892U + 10n 23992U 23993Np + 0 -1e 23993Np
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Solids 1. (a) Cite the difference between atomic mass and atomic weight. (b) Silicon has three naturally-occurring isotopes as shown in the table below. On the basis of this data‚ confirm that the average atomic weight of Si is 28.0854 amu. |Silicon Isotope |Natural Abundance |Atomic mass of | | | |isotope (amu) | |28Si |92.23 % |27.9769 | |29Si |4.68 % |28.9765
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1. What is the purpose of science? The purpose of science is to understand. With science‚ we ask questions‚ seek answers‚ and prove or disprove our theories and speculations. According to the text on page 10 “Science is a way of knowing about the natural world.” (Citations will be provided at the end of the worksheet‚ rather than a continuous re-pasting each time.) 2. Define organism. Give an example of a unicellular organism. According to the text on page 3‚ “Organisms‚ such as trees and humans
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is radioactive‚ it is constantly emitting particles and changing into other elements‚ like thorium. Uranium has a well-established radioactive decay chain. U-238 and U-235 (which has 143 neutrons) are the most common isotopes of uranium. Uranium naturally includes all three isotopes (U-238‚ U-235‚ and U-234) [3]. Once Uranium enters your body in any way‚ it is widely distributed. Bone acts as a reservoir for the metal. Uranium produces chemical damage to the body and about 60-80 % of tissues
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specificity of the measurement (ie: 3.0000001 g) Accuracy- The actuality if the measurement (ie: TRUE weight it 5.6 g) Atoms‚ Isotopes‚ and Atom Theories Using atomic number and mass # to count protons‚ electrons‚ and neutrons Atomic number= # protons= # electrons Mass number= protons+ neutrons (so: mass # - # protons= #neutrons) Isotopes- variation of neutrons in an element(top left corner of atomic symbol) H‚ H‚ H Counting protons‚ electrons‚ and neutrons in IONS Ion-
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Electron Very small (0.00055) 1- 5. Radioactive isotopes Radiation What is it? Relative charge How does the nucleus change? Stopped by? Deflection in electric field? Alpha α Helium nuclei ⁴₂He +2 2 fewer protons 2 fewer neutrons Paper or skin Low Beta β Electrons ₋₁°e -1 1 more proton 1 fewer neutron Aluminium foil High Gamma ϒ Electromagnetic radiation none No change Lead sheet None 6. Half-life i. The time taken for half a radioactive isotope/substance to decay. ii. Not affected my temperature
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