DEVELOPMENT OF THE ATOMIC THEORY Part A: HISTORY * 1869: Mendeleev formulated the Table of the Elements - listing them by their atomic weight and grouping them with similar characteristics. * 1897: JJ Thomson discovered electron and isotopes‚ and invented the mass spectrometer. * 1898: Marie Curie discovered and isolated radium‚ a new element which unprompted disintegrated into other elements. This proved that the atoms of one element at least were not indivisible. * 1911: Ernest
Premium Atom Neutron Electron
IF YOU WERE PRESIDENT HARRY TRUMAN‚ WOULD YOU HAVE MADE THE SAME DECISION AS HE DID‚ WITH DROPPING THE ATOMBOMB ON HIROSHIMA? The 6th of August 1945 was a day that people will always remember with terror. On this day‚ an atomic bomb was used by the U.S. against Japan‚ in the city of Hiroshima. This was the first time in world history. Before this sad event‚ Japan and the U.S. were having conflicts with each other because Japan tried to invade parts of Europe and the Pacific. In an attempt stop Japanese
Premium Atomic bombings of Hiroshima and Nagasaki Nuclear weapon World War II
Atomic structure: scientists 1. Democritus: 1st person to think of atom (500 BCE)- philosopher Atom is the smallest piece of an element that has same properties as the element. 2. Lavisier: Law of conservation of mass/ matter • Mass can’t be created or destroy; same amount of stuff 3. Joseph Proust: Law of constant composition (law of definite Proportions) • A compound is always made of the same elements in the same ratio. 4. John Dalton: English school teacher who derived the atomic theory
Free Atom Electron Electric charge
The Atomic Model has changed over time‚ as the years‚ decades‚ and centuries go by we get a better understanding of the atom and what it looks like. The Atomic Model has changed drastically based on the understanding we have on it‚ each new model has added more information to what we know about it‚ making it easier for scientists and the world to understand. The Atomic Model is a very important part of Science and Chemistry‚ it helps explain the structure and what is inside the atom‚ the particle
Premium Atom Chemistry Electron
Cafes Monte Bianco Case Context: The company located in Milan‚ Italy. It was found by Mario Salvetti as a manufacturer and distributor of premium finest coffees. The company faces a hard decision that may affect their future. The company wants to know whether or not they should keep working in the same investing. An important meeting was there among the top management team’s members to discuss the future of the company. The company’s performance was good in 2000. Profit was shown
Premium Cash flow Costs Cost
History of the Atomic Model Just as we once believed that the earth was flat‚ our understanding of the atom was once extremely limited. As time passes‚ we begin to discover more and more about the world we live in. We have come to know much about the atom over the past two hundred years through the work of numerous brilliant scientists. Throughout history‚ scientists have come up with many experiments and atomic models to explain the atoms all around us‚ all leading up to our modern understanding
Free Atom Electron Neutron
The History of Atomic Theory Atomos: Not to Be Cut The atomic model has changed throughout the centuries starting in 400 BC‚ when it looked like a billiard ball. Democritus: 400 BC The question: Can matter be divided into smaller particles? Or can it be infinitely divided? Matter can be divided into the smallest piece‚he named it “atomos”: not to be cut. Said that atoms were small‚ hard particles that were all made of the same material but were different shapes and sizes. Atoms were
Premium Atom
Part 1: Written Questions 1. Explain the hygiene procedures in your workplace. In café 90073 the following hygiene procedures must be adhered to; * Personal hygiene- no nail polish‚ hair tied back‚ regular showers‚ wash hands regularly * Correct food storage- FIFO * Suitable dress & protective wear- enclosed shoes‚ apron‚ mesh gloves to operate meat slicer * Avoidance of cross contamination- coloured coded chopping boards * Safe & hygienic handling of disposal- double
Premium Hygiene Food Cleanliness
Cakelove and love cafe 1. How was Warren Brown able to finance the growth of his company? Warren financed his first storefront by securing a commercial loan from his community bank‚ CityFirst Bank of DC because other commercial leaders in larger‚ mainstream financial institutions thought it was a particularly good credit risk. After opening CakeLove‚ he turned again to CityFirst Bank to finance it because CakeLove was too new to have positive cash flow to support itself. After CakeLove
Premium Finance Accounts receivable Balance sheet
Democritus Democritus ( 460 a.c.– 370 a.c.) was an Ancient Greek philosopher born in Abdera‚ Thrace‚ Greece. He was an influential pre-Socratic philosopher and pupil of Leucippus‚ who formulated an atomic theory for the universe. His early deductions about the composition of the basic component of nature led him to believe in unseen and uncuttable particles ‚ called atomos. This Greek philosopher wondered how he could be sitting in one part of his
Premium Electron Atom Electric charge