Isotope

Isotopes are elements that have the same number of protons, but differ in the number of neutrons. Also, isotopes demonstrate the same chemical properties, but vary in atomic mass. 2a. The density difference between the initial DNA (at zero generation) and the DNA after one generation is 0.007 gm. cm-3. Between…

When the bacteriophages infected the bacteria, the others contained the radioactive isotopes in their structures. This was performed once for the sulfur-labeled phages and for phosphorus-labeled phages. The phage coats remained on the outside of the bacteria, while genetic material entered. Disruption of phage from the bacteria by agitation…

The rel\laining 1.8 grams was converted into heat. C) The remaining mass was destroyed. D) Nothing, the burned wood simply has a mass of 1.2 grams. E) none of the above 25) A fictional element has two naturally occurring isotopes with the natural abundances shown here: 25) ISOTOPE ABUNDANCE 18…

this group have a biological role, but arsenic itself is a toxin (see section 1.x). Some additional chemical properties of elemental arsenic are shown in table_1. Elementary Arsenic Elementary arsenic has only one stable isotope 75As, and 33 radioactive isotopes. Generally, the isotopes are relatively short lived with the longest lived radioisotope (73As) having a half-life of 80.3…

existence of a nitrogen isotope sensitive band from a peak/trough at 1334/1309 cm-1 demonstrating that there is nitration of the vinyl group to some extent at pH 7.5 without nitrite coordination to the heme. This result was consistent in both the high and low frequency resonance spectra. At pH 5.5, the difference in traces of the high frequency RR spectra demonstrated formation of a 6cLS heme species and presence of two peak/trough features suggesting the nitrogen and oxygen isotope sensitivity…

in 1904, Hahn made his first big discovery and contribution by discovering radiothorium, a radioactive isotope of thorium. In late 1905, Hahn moved to the Physical Institute of McGill University in Montreal, Canada. Here he worked with Ernest Rutherford, famous father of nuclear chemistry and many other chemistry achievements. Hahn during this time under Rutherford discovered a radioactive isotope of actinium, and investigated its and radiothroium’s alpha-rays (“Otto Hahn Biographical”, Nobel…

Scientists have discovered ancient grains. No, not the quinoa and spelt you'll find in Whole Foods, but ancient grains with explosive origins from Space. By extracting dust grains from meteorites, scientists were able to find out their history and how they came to Earth. STARS SPEWED OUT PRESOLAR GRAINS ALL OVER EARTH As one may assume, presolar grains are older than the sun. They were thrown up by the stars in the universe hundreds of millions of years ago. Way before Earth had a solar system…

white phosphorus with a mercury catalyst and a black phosphorus seed. There are three isotopes of phosphorus, P 31, P 32, and P 33. P31 is the stable form of phosphorus. P 32 is a radioactive version that has a half life of 14.28 days. P 33 is also a radioactive version of phosphorus that has a half life of 24.3 days. Because of their short half lives there are not really any uses for those phosphorus isotopes. Each form of phosphorus has different uses. Since white phosphorus is highly…

The medical use of radioactive isotopes for cancer treatment can be classified as radiation therapy. The radiation that specific isotopes give off are utilized for effecting cancer cells. First of all, what is radiation? Radiation is energy that is carried by waves of streams of particles. The energy from radiation damages the genes (DNA) in the cancer cells. The damage done to the cells prevent them from growing and dividing, and often cause them to die off. Nearby normal and healthy cells can…

Magnesium Magnesium is one of the best elements you can own it’s a 3rd period element its part of the alkaline earth metal family. Magnesium is a metal and it’s a solid, with a isotope of 24 and really high energy level. Buy magnesium it’s going to be your favorite purchase you will ever make you won’t regret it. Magnesium was discovered in 1808 by a guy named Sir Humphrey Davy but it was first experimented by joseph black. The Country it was discovered in was England in the United Kingdom.…