Why Is The Atomic Theory Important

Concept 2.1 Matter consists of chemical elements in pure form and in combinations called compounds

John Dalton wrote the modern atomic theory, a fundamental component of that is, the mole ratios of elements in a compound will be small whole numbers.

-Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford, experimented with 38 metals, he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table, lead to modern definition of atomic number (# of protons in atom’s nucleus) and the recognition the

the old view of atoms as the basic building blocks of the material world and Newtonian physics

According to DePra’s poem, “The electron is minus, the proton is plus,/ the neutron is neither” (Doc. 2). In other words, a neutron is neutral, the electron is negative and the proton is positive. After these discoveries, more inventions were made to help further our understanding of atoms, for instance, the the electron microscope. Electrons were discovered before Rutherford by JJ Thomas (OI). Thomas was using a cathode ray and discovered that atoms are made of smaller subatomic particles

What is an atom? An atom is the basic building block of everything. An atom is made of electrons protons and neutrons and the number of protons determines the element. Back in the 1800’s this whole idea was unknown. In the 1800’s steam was starting to power everything. It became important to know how steam works, so you can learn to use it more effectively. It was this idea that drove Dalton to research the atom.

Around 2,500 years ago, Democritus and his partner Leucippus were the first ones to develop the atomic theory in written history. Their theory proposed that every kind of matter was made up of tiny particles, which were named atomos, which means that it is indivisible. This meant that Democritus and Leucippus thought there were little particles of everything, but, the next breakthrough in atomic theory wasn’t made until the early 1800s with a french chemist by the name of Antoine Lavoisier, he was the one who came up with the idea of the law of the conservation of mass, which states that matter stays the same even when it changes shape or form. Then, James Dalton said that all matter was made up of atoms, which were indivisible, and unbreakable.

The second main contributor toward the atomic structure was John Dalton. John Dalton was the one who brought the atomic theory talk back into play after 2000 years from Democritus. Dalton become fond of the atomic structure following his love from meteorology. He claimed that the forces of repulsion that caused pressure only were between the same atoms and the atoms inside a mixture had different weights and complexity. He then decided to calculate the atomic weights by determining the percentages of each composition in a compound. This allowed him to be able to

Rutherford’s understanding of the atom was that the protons were clustered together in the nucleus. The nucleus is then surrounded by empty space occupied by electrons. (Lucas & Wright, 2001)

Around 1803 John Dalton, an English chemist developed the first useful atomic theory of matter. Amedeo Avogadro, the Italian chemist in 1811 published an article drawing the distinction between the atom and the molecule, which now is known as “Avogadro’s

“By 1687, he had theorized that gravity was a force that could hold objects, such as the moon, in orbit around the Earth, and he worked out equations to prove it” (Challenging Limits). He then calculated the laws of motion that held the planets in their orbits around the sun. Along with his research, he invented calculus, the method for working out the speed of an object at any given moment during its path. By the 20th century, scientist could demonstrate atoms and the tiny charged particles they contained called electrons. The electrons are virtually invisible, but Leeuwenhoek used them from an electron microscope that magnified ten million times. Allowing future scientist to develop the MRI scanner, a precise diagnostic tool used to learn about the work of the brain. In addition to the discovery of atoms and their electrons, a physicist by the name of Albert Einstein formulated the theorem E=mc2. Stating that energy resided in matter itself. With this, scientist learned that atoms are our greatest repository of energy. Scientist began to ask if they themselves, “if we could split atoms, could we release the new, limitless supply of energy” (Challenging Limits)? Soon, scientist did split atoms that released massive surges of energy, but also produced lethal radioactivity. This groundbreaking discovery provided a possible solution to what created the

An Atom is the the basic building block of all matter. Atoms are made up of Particles, called: Protons, neutrons and Electrons. Protons carry a positive charge, the neutron carry 's a neutral charge and the electron carry’s a negative charge. The Atom has two main parts the Nucleus and the Electron Shell. The Nucleus contains the Protons and Neutrons. The electron Shell Contains the The electrons.

Marie Curie LIFE OF MARIE CURIE      Marie Curie(1867-1934) was a French physicist with many accomplishments in both physics and chemistry. Marie and her husband Pierre, who was also a French physicist, are both famous for their work in radioactivity.      Marie Curie, originally named Marja Sklodowska, was born in Warsaw, Poland on Nov.7, 1867. Her first learning of physics came from her father who taught it in high school. Marie's father must have taught his daughter well because in 1891, she went to Paris(where she changed her original name) and enrolled in the Sorbonne.

     Marie Curie was born, Maria Sklodowska on November 7, 1867. She grew up in Warsaw, Poland. She would become famous for her research on radioactivity. Marie Curie was the first woman to ever win a Nobel prize, and the first ever to win two Nobel prizes. She is most famous for the discovery of Radium and Polonium. Her work not only influenced the development of fundamental science, but also began a new era in medical research and treatment.

Nuclear knowledge has existed for a long time. Nuclear Engineering U.S. Department of Energy relates, ―By 1900, the physicists knew the atom contains large quantities of energy‖ (par 11). Many others formed good theories, such as Ernest Rutherford and Einstein’s contribution with his equation E=mc^2. In 1934