radioactivity are likely to give rise to diarrhea‚ nausea‚ and vomiting and hair loss. High levels of it will hurt people’s central nervous system‚ even be life-threatening. If radioactive isotopes‚ such as iodine-131‚ are absorbed and accumulated in bones‚ people will come down with kinds of cancer. As for long-lived isotopes‚ such as cesium-137‚ even low level of radiation can be life-threatening when in long exposure to it（3）. When people are directly exposed to radioactive
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caused the explosion. According to Russian‚ Italian‚ and German researchers the event spawned a lot of acid rain in the area. Scientists took many samples from peat levels of the area. These findings show that heavy levels of nitrogen and carbon isotopes 15N and 13C were in the soil. The highest accumulations occurred near the epicenter of the blast. These samples also showed iridium and nitrogen in the peat layers. This means that tons of acid rain had poured on the surface. This would be caused
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UNIT 1 REVISION CHECKLIST Topic 1.1 Can you a) define atomic number‚ mass number‚ isotopes‚ relative atomic mass‚ relative molecular mass b) remember the four stages in mass spectrometry and explain how each one works c) calculate relative atomic mass from isotopic composition data‚ or from a mass spectrum of an atom d) deduce relative molecular mass from the mass spectrum of a molecule e) Give the electronic configuration of atoms with atomic number 1-36 and of the common ions
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Unit One Continued Biology is Life and the Living Characterstics of living things Must have Complex and Organized structure based on element carbon Flower (complex and organized) Reproduction and show gene controlled by heredity Camel reproduces and heredity is the traits based on the genes of the DNA Instructions on how to create YOU Crystal reproduces but has no Genes and no control Living things show growth and development Egg cell with sperm to embryo to child 23+23 for DNA Energy
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Matthew Meselsohn and Franklin Stahl devised and executed an experiment to study DNA replication1. They attached two isotopes of nitrogen to each strand of DNA to determine what proportions of the isotope were present in DNA strands after multiple replication process. They observed that after one replication of DNA‚ each new molecule of DNA possessed one strand with the heavy isotopes of nitrogen. This evidence showed that the replication of DNA is semiconservative – the idea of copying via template2
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isolate 99.9% of pure titanium‚ by heating titanium chloride with sodium‚ in a pressure cylinder to red-heat temperatures. When heated‚ Titanium is malleable and when in water it is insoluble although it’s soluble in concentrated acids. Titanium has 26 isotopes‚ 5 of which are stable; Ti-46‚Ti-47‚ Ti-48‚ Ti-49 and Ti-50. In the periodic table‚ Titanium is expressed “Ti” and is located in group 4 and period 4. Its Atomic Number is 22 and its density is 4.5 grams per cubic centimeter. This meaning it
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unusual for a metal. Ductility- When a solid material stretches or breaks under tensile stress. Natural occurring and man made Bismuth have a very low ductility. The hardness of Bismuth is 2-2.5. Bismuth has 33 isotopes with mass numbers from 185 to 217. Bismuth-209 is the only stable isotope‚ even with the natural radioactivity. Since Bismuth is slightly radioactive it has a slow rate of Alpha particle decay. Alpha Particle Decay is a type of radioactive decay within an atomic nucleus which emits
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had been on top‚ though more dense molecules were in it‚ because Na may have dissolved in water making the aqueous layer denser and subsequently positioning the aqueous layer on the bottom. The gas chromatography showed that there was each kind of isotope present in the mixtures‚ but at all different abundances. Techniques that could have been improved upon would be making sure to use the proper solutions at proper times‚ and maybe try harder to prevent side reactions from occurring by
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of sulfur is 2 mohs (S). Sulfur has four natural isotopes‚ all of which are stable. They include: sulfur-32‚ sulfur-33‚ sulfur-34‚ and sulfur-36. Sulfur-32 is the most abundant‚ with 94.99% of all atoms having sixteen neutrons. The second most abundant is sulfur-34‚ whose abundance is 4.25%. Sulfur-33 and sulfur-36 are rare to find‚ with natural abundances of 0.75% and 0.01%‚ respectively (RSC). There are at least six known radioactive isotopes of sulfur‚ with the most prominent being sulfur-35
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by the electrons in the outer shell d. lest than the sum of the charges of the protons in tire nucleus due to nisielding by the electrons in the lower‚ filled shells a. greater than the suns of the charges on the protons in the nucleus 4. isotopes are a. atonts with the same nutotber of neutrons but different nuntbers of protons b. atoms seitls the same number of protons but different numbers of neutrons c. atoms witls tire same sum of neutrons plus protons but different numbers of neutrons
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