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The forever evolving Atomic Theory

Georgina L, Christina M and Ilenia D

Year:460BC-400BCATOMS ARE INDIVISIBLE...DemocritusDemocritus, born in Abdera, Greece in 460BC, is widely known for developing the foundational theory used by millions of scientists throughout the centuries; everything is composed of atoms. Emerging with this miraculous theory, which lead scientists to further develop the atomic theory, was Democrituss main and most popular contribution to Science. The scientist responsible for beginning the atomic theory died at the age of 90 in 370BC.

Democritus hypothesized that atoms cannot be split no matter what their size and this statement supported his other hypothesis which stated that atoms are indestructible, indivisible and always in motion.

Democritus titled his new discovery atomos, which is known today as the atom.

The scientist gave complex explanations on how planets, stars and systems of the Universe formed and after developing his atomic theory, Democritus was identified as the founder of modern Science.

Democrituss mentor Leucippus, originally came up with the atomic theory which was later adopted by Democritus.

According to Democritus atoms were miniscule quantities of matter. Democritus hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible.

He believed that there are an infinite number of atoms. This hypothesis was created in 450BC approximately.

His atomic theory stated that The universe is composed of two elements: the atoms and the void in which they exist and move.

Georgina L

ATOMS ARE INDIVISIBLE...DemocritusDemocritus atomic theory summarised:1. All matter consists of invisible particles called atoms.2. Atoms are indestructible. 3. Atoms are solid but invisible.4. Atoms are similar.5. Atoms differ in size, shape, mass, position, and arrangement. Solids are made of small, pointy atoms. Liquids are made of large, round atoms. Oils are made of very fine, small atoms that can easily slip past each other. Democritus atomic model: Democritus atomic model assisted scientists in further developing their understanding of the universe and what its made of by supplying a basic model for the atom. Democritus model consisted of a plain sphere containing no sub particles, such as protons, neutrons and electrons. The model does not display a nucleus, but helped in the development of the atomic theory by supplying a basic insight on the construction of the atom.

Democritus provided The idea of the existence of atoms!

Georgina L

Year:1650+UNIVERSAL FORCES...Isaac NewtonIsaac Newton, born on the 25th of December 1642 in Woolsthorpe, England, proposed that the universe consisted of small solid masses in motion.Newton, who became a maths professor at the ripe age of 26,suggested that atoms were held together by attractions that can be known as universal forces. The scientist died in 1727

Isaac Newton provided the basic classical mechanics and mathematics which were vital to the further development of the atomic theory initially proposed by Democritus. Scientists later used Newtons theories and hypothesis to develop their theories, thus allowing for the development of the atomic theory.

Isaac Newton provided The foundation laws needed for understanding how atoms work!

Georgina LYear: 1808DALTON THE LAWyer...John Dalton

Various atoms andmoleculesas depicted in John Dalton'sA New System of Chemical Philosophy(1808).-Wikipedia

John Dalton, born in September 1766 in Cumberland, England, proposed a vital set of laws which correlate with atoms and the way they function. These set of laws stated that: Elements are made of extremely small particles calledatoms.Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.Atoms cannot be subdivided, created, or destroyed.Atoms of different elements combine in simple whole-number ratios to formchemical compounds.Inchemical reactions, atoms are combined, separated, or rearranged.And most importantly, Atoms and Elements are different.

Aside from being burdened with colour blindness, Dalton constructed an atomic model which described that atoms were tiny, indivisible, indestructible particles and that each one had acertain mass, size, and chemical behaviour. John Dalton was inspired by Democrituss initial attempts at developing an atomic theory, and ergo, built his ideas upon historical discoveries made by Democritus.

Georgina LJack of all trades: Dalton was a chemist, teacher and physicist!John Dalton provided The first laws of atom functionality!Death: 1844SORT IT ALL OUT...Dmitri Mendeleev

Dmitri Mendeleev provided The first periodic table, systematically categorising elements! Year:1869+Dmitri Mendeleev, a Russian scientist born in Tobolsk, Siberia in 1834, deciphered a way to clearly sort the 63 known elements into an understandable, simple table now known as the Periodic table.

In 1869, Mendeleev, after delving into the difficulties of sorting and organising the 63 elements, experienced a dream which would alter his way of thinking and lead him to create the periodic table. The Russian scientist organised the atoms according to their atomic mass due to being unaware of their structures. Mendeleev purposely left spaces in the periodic table for the remaining missing elements which were yet to be discovered or whose mass was unknown. However, he also predicted the existence and properties of new elements.

His first Periodic Table was compiled on the basis of arranging the elements in ascending order of atomic weight and grouping them by similarity of properties.

Mendeleev studied science at St. Petersburg and graduated in 1856 and, after his death in 1907, is best known for constructing the timeless table used by millions today.

Georgina LJoseph John Thomson(1856-1940) Thomson was a British physicist and Nobel laureate.He suggest that the fundamental unit was over 1000 times smaller than an atom.In 1904 Thomson proposed the plum pudding model where electrons were embedded in the atom.In 1906 He discovered that hydrogen had only a single electron for atom.In 1912 He discovered that neon had two types of isotopes, that have two different atomic masses.

Ernest Rutherford (1871-1937)was a New Zealand-born British chemist and physicist who became known as the father of nuclear physics.In 1899 He coined the terms alpha ray and beta ray to describe the two types of radiationHe showed that the atom consisted of a positively charged nucleus and negatively charged called electrons

Nielsen Bhor (18851962)

The electrons can only travel in certain orbits (called by Bohr as the "stationary orbits"): at a certain discrete set of distance from the nucleus.The electrons of an atom revolve around the nucleus in orbits. These orbits are associated with definite energies.The electrons jump from one shell to another.

Albert Einstein (1879 1955) In 1907 Einstein proposed a model of matter where each atom in a lattice structure is an independent harmonic oscillator.In 1907 Einstein proposed a model of matter where each atom in a lattice structure is an independent harmonic oscillator.In 1907 Einstein proposed a model of matter where each atom in a lattice structure is an independent harmonic oscillator.

Erwin SchrodingerErwin Schrodinger was born on August 12, 1887 in Vienna. Schrodinger began to think about explaining the movement of an electron in an atom as a wave. By 1926 he published his work providing a theoretical basis for the atomic that Niels Bohr had proposed based on laboratory evidence. It became known as Schrodingers wave equation. This was the second theoretical explanation of electrons in atom, following Werner Heisenbergs matrix mechanics. Schrodinger showed that the two theories were identical, only expressed differently. He won the Nobel Prize with Paul Dirac. Schrodinger continued to work with quantum physics until his death in 1961.

James ChadwickJames Chadwick was born on the 20th October, 1891 in Cheshire, England. In 1932, Chadwick discovered that the particle in the nucleus of the atom that became known as the neutron because it has no electrical charge. In contrast with the helium nuclei which are charged, this new tool is capable penetrating and splitting the nuclei of even the heaviest elements.

This discovery prepared the way towards the fission of uranium and towards the creation of the atomic bomb. For this discovery he was awarded Hughes Medal of the Royal Society in 1932 and the Nobel Prize for Physics in 1935. Chadwick died in Cambridge on July 24, 1974.Enrico FermiEnrico Fermi was born on the 29th September, 1901 in Rome, Italy. He is most known for his work on beta decay, the development of the first nuclear reactor and for the development of the quantum theory. After James Chadwicks discovery scientists worked to discover more about the interior of the atom. In 1934, Fermi came up with an idea to use neutrons as projectiles instead of helium nuclei. He would shoot a neutron like arrow into an atoms nucleus.

Many of the nuclei absorbed the extra neutron creating isotopes for every element. This was not the only discovery that he made. He found out that slowing down a neutron would make it have a larger impact on the nucleus. Later on in Fermis life he discovered the nuclear chain reaction. This led to the construction of atomic bombs and nuclear power. For these discoveries Fermi won many awards. Fermi passed away on November 29, 1954 to stomach cancer.

Higgs BosonThe Higgs Boson is a very recent discovery as it was only discovered on the 4th July, 2012. A new boson has been discovered and it behaves like the Standard Model Higgs. The discovery of this boson would be proof of an invisible energy field that fills the vacuum of space. It is still likely to take a few more years of research to find out whether the new particle is a simple Higgs boson or if its part of something more complex.

theory atomic democritus rutherford bohr einstein newton law theory atomic atomAtomos democritus greek england develop Protons neutrons electrons shells nucleustheory atomic democritus rutherford bohr einstein newton law theory atomic atomAtomos democritus greek england develop Its the end of this presentation, but the beginning of a new understanding of the atomic theory...Protons neutrons electrons shells nucleustheory atomic democritus rutherford bohr einstein newton law theory atomic atomAtomos democritus greek england develop Thank you atomic atom Atomos democritus

Georgina L