Resumen de science

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Resumen de science

  1. 1. Resumen de Science History of the Atom 600BC: Thales of Miletus discovered that a piece of amber, after rubbing it with fur attracts bots of hair and feathers and other light objects. 460BC: A Greek philosopher Democritus, develop the idea of atoms. 1800: John Dalton performed experiments with various chemicals. 1897: The English physicist J.J. Thompson discovered the electron and proposed a model for the structure of the atom. 1911: Ernest Rutherord experiment.(investigate the inside of the atom). 1
  2. 2. 1919: Rutherford model. Finally he identify the particles of the nucleus as discrete positive charges of matter. When there was something wrong in his model Niels Bohr came up with a theory that said the electrons do not spiral into the nucleus and came up with some rules for what does happen. The electron can exist in only one of the orbits. Characteristics of metals and non-metals Metals • They tend to be shiny • They are malleable and ductile • High melting points • High densities • Solids at room temperature (except Mercury) • They conducts electricity Non-Metals • They are opaques • They are dulls • They are brittle solids • Poors conductors of electricity (except Carbon) • Low melting points Substance name Metal or non-metal? Iron Metal Sulphur Non-metal Zinc Metal Sodium Metal Mercury Metal Carbon Non-metal Iodine Non-metal Copper Metal Atoms 2
  3. 3. An atom is the smallest unit of an element, consisting of a dense, central, positively charged nucleus surrounded by a system of electrons, equal in number to the number of uclear protons. All matter is made of tiny particles called atoms. Every atom consists of a nucleus, and a cloud of particles called electrons whizz non-stop round the nucleus. NUCLEUS ELECTRON CLOUD Elements An element is a substance that is made of only one kind of atom. Each element has a symbol. 3
  4. 4. Compunds A compound contains atoms of different elements joined together. The symbol of a compound is called it’s formula. Differences Atoms Elements Compounds Is the smallest particle Is a substance which On the other hand is that can take part in a cannot be spilt into defined as a pure chemical change. two or more simpler substance consisting They are extremely substance by any sort of similar type of small. of chemical means. molecules which can They are made up of be made up of particles which can different elements. either be atoms, molecules or ions. 4

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