also proposed the law of constant proportions‚ which proved that inorganic substances are made of elements that are in constant proportion by weight. Marie Curie (1867 - 1934) - She was a Polish born chemist and physicist who later acquired French citizenship. She is renowned for her discoveries in the phenomenon of radioactivity. Marie Curie discovered the radioactive elements radium and polonium for which she was awarded the Nobel Prize in Chemistry. John Dalton (1766 - 1844) - He was an
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Radioactive decay is the process by which an atomic nucleus of an unstable atom loses energy by emitting ionizing particles (ionizing radiation). There are many different types of radioactive decay (see table below). A decay‚ or loss of energy‚ results when an atom with one type of nucleus‚ called the parent radionuclide‚ transforms to an atom with a nucleus in a different state‚ or to a different nucleus containing different numbers of protons and neutrons. Either of these products is named the
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did not allow her to choose her seat. Rosa Parks known as the “mother of the civil rights movement” put the wheels of change in motion by refusing to give up her seat for a white man. That is what ignited the eternal spark of anti racism. No 2. Marie Curie was the first women to receive the Nobel Prize and the first person to win it for 2 separate categories. Her first award was for research into radioactivity (Physics 1903). Her
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The History of the Discovery of Radiation and Radioactivity Introduction: Radiation can be defined as the propagation of energy through matter or space. It can be in the form of electromagnetic waves or energetic particles. Ionizing radiation has the ability to knock an electron from an atom‚ i.e. to ionize. Examples of ionizing radiation include: • alpha particles • beta particles • neutrons • gamma rays • x-rays Non-ionizing radiation does not have enough energy to ionize atoms in the material
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Democritus Democritus believed that there were four properties of atoms: Atoms are small hard particles‚ Made of a single material formed into different shapes and sizes‚ They are always moving‚ and they form different materials by joining together. In 425 BC‚ Democritus was suggesting ideas that were hundreds of years ahead of him. He suggested that everything was made up of atoms. He suggested that atoms were small hard particles‚ were a single material formed into different shapes and sizes
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NATHANIEL JOSEPH D. GOBRES GRADE 4 – St. Catherine FOREIGN SCIENTISTS AND THEIR CONTRIBUTIONS Aristotle Student of Plato and a tutor to Alexander the Great‚ Aristotle was a genius Greek philosopher and scientist of the ancient age. Born on 384 BC‚ Aristotle was a biologist‚ a zoologist‚ ethicist‚ a political scientist and the master of rhetoric and logic. He also gave theories in physics and meta physics. Aristotle gained knowledge in different fields with his expansive mind and prodigious writings
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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 Rutherford established that the nucleus was very dense
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The Second Industrial Revolution changed the society in many ways. Marie Curie‚ Albert Einstein‚ and Sigmund Freud changed the way many people thought about the world through their studies. Zionism‚ feminism‚ racism‚ social darwinism‚ and modernism were very important ideas and acts during this time. Advancements in architecture and technology were big parts of the Second Industrial Revolution. Even though racism was a very serious problem during the Second Industrial Revolution‚ there were many
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Antoine Lavoisier was born in the year 1743 to a wealthy family and inherited a huge fortune at the age of five after the demise of his mother. A noble man by profession has contributed a lot in both chemical and biological science. Antoine Lavoisier is the first person to term Oxygen and Hydrogen and also was the first one to establish that sulphur is not a compound but an element. He was the first person to determine that air is a mixture of nitrogen and oxygen. His other contribution includes
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When deciding whether or not mistakes are a part to making discoveries‚ the sides are pretty evened out. But with this essay‚ the siding is that mistakes are a key part to making discoveries. Let’s get into it. First off‚ we have an example of the argument. In the article Lost Cities‚ Lost Treasures‚ there is a scholar and businessman known as Heinrich Schliemann. Heinrich is searching for the lost city of Troy. He comes upon a man who owns a presumed site‚ named Frank Calvert‚ who is modest and
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