Alpha particle

Experimental Conditions It is important to note that in our lab experiment we used galena, PbS, with 170 – 200 mesh (i.e. there were 170 to 200 wires per inch of sieve used to sort out the galena crystals). This means our diameter range of our particle size was 75-90 μm. Table 1:Experimental Conditions for PbS leaching FeCl3·6H2O (g) to be added is found by: The weight of FeCl3·6H2O (g) added in our experiment was slightly larger than the theoretical amount of FeCl3·6H2O needed, as can be seen…

radiations that were being emitted from the elements Uranium and Thorium, which he named. Rutherford discovered the counterpart of the electron. He discovered a positively charged subatomic particle known as the proton. Ernest was the first of the scientists to reference or hypothesize of a neutrally charged particle located in the atom. Rutherford 's nuclear atom (Rutherford 's atomic model), describes an atom to be a very small, dense, positive core called a nucleus. Max Planck contributed…

James Chadwick was born October 20th, 1891 in Bollington, United Kingdom. His parents were John Chadwick and Anne Mary Knowles. He attended Manchester High School and Manchester University (James Chadwick – Biographical, Nobelprize.org). While he was at Manchester University he worked on a research project in Earnest Ruthford’s laboratory. Chadwick finished his project successfully and graduated with first class honors in physics in 1911. He continued to work in Earnest’s laboratory until in…

Contrary to the title, the discovery of astatine was anything but a momentary process. Many scientists discovered different astatine isotopes, atoms with the same number of protons but differing numbers of neutrons, but were unable to either reproduce their results or keep the isotope in existence for any useful amount of time. After decades of possible discovery and rediscovery, astatine was officially included in the periodic table of elements with the abbreviation At and an atomic number of…

Radon is an unscented gas that comes from the radioactive decay of radium; radium itself comes from the radioactive decay of uranium, therefore radon originates from the radioactive decay of uranium. Approximately all uranium is found in the ground and bedrock, meaning radon continuously leaks out of the ground into the air, water, and built structures, such as houses. As stated above, Radon can be found outdoors in the air, soil, water in lakes and rivers, and even inside built structures.…

with Ernest Rutherford in Cavendish Laboratory at Cambridge. Together, they were an unstoppable duo, inventing a new, complex idea that was later named the neutron. In the beginning of the Twentieth Century the atom was imagined of two types of particles: protons and electrons. The problem with thinking in these terms was that the atomic mass measurements were not matching up with the atomic number, or protons in the nucleus of an atom. An example of this is the helium atom who has the atomic…

Honor means great respect for what you have done especially big accomplishments. Honor is when someone respects you for your accomplishments. Scientist Ernest Rutherford was born on August 30, 1871, in Spring Grove New Zealand. A pioneer of nuclear physics and the first to split the atom in half he was awarded the 1908 Nobel Prize in Chemistry for his theory of atomic structure. His father James had little education and struggled to support the large family of 14 but his mother Martha worked…

History of the Theory of Atoms Before the age of modern technology, theories of the atom were still created. Most notably was Democritus who was thought of as being the start of modern science when he first came up with the idea of the atom. It was not until J.J. Thomson changed the way atoms were understood with the discovery of the electron. It was not soon after when Ernst Rutherford disproved Thomson’s model with his gold foil experiment. Finally, Niels Bohr built off Rutherford’s gold foil…

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 also be affected by the…

The atom is the smallest unit of matter. The name “atom” comes from the Greek word atomos, which means “uncuttable.” Atomic theory states that all matter is made up of these small particles, and that these atoms, and the matter made from them, cannot be created nor destroyed, merely reshaped and reformed. Modern chemistry unofficially began in the eighteenth century. French scientist Antoine Lavoisier discovered the law of the conservation of mass c. 1785. This law states that “The total mass…