chemistry C1 (1)

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  • Created by: haidee
  • Created on: 01-04-12 15:09

Periodic table

  • here are about 100 different elements that are organised in the periodic table
  • the metals are found on the left hand side of the table and the non-metals are found on the right
  • the vertical columns in the table are called groups
  • the horizontal rows are called periods

Atomic structure

  • elements are the simplest chemical substance
  • they are made of only on tyoe of atom and cannot be broken down into anything simpler by chemical methods
  • an atom is the smallest part of an element that can take part in an chemical reaction
  • atoms are made od s central nucleus which contains protons and neutrons
  • around the nucleus there are orbiting electrons
  • protons: 1 relative mass, + charge
  • neutrons: 1 relative mass, no charge
  • electrons: no mass, - charge
  • atoms do not have a charge because they have the same number of protons and electrons which have equal and opposite electric charges

Periodic table structure

  • the atomic number of the element is shown as the smaller number on the periodic table ans is the same as the number of protons in the nucleus
  • this is sometimes called the proton number
  • in the periodic table, elements are arranged in order of their atomic number
  • each element also has a atomic mass which is the number of protons and neutrons in the nucleus
  • no of neutrons = atomic mass- proton mass

Elements

  • mercury and bromine are the two only elements liquid at room temperature

John Dalton's atomic theory

  • john dalton was born in 1766
  • he was amazingly clever- by the time he was 12 he was teaching other children
  • dalton was intrested in almost anything, making observations of the wether as well as being the first person to study colour-blindness (he was colour-blind)
  • dalton is best remembered of his odeas about chemistry ans in particular his theories about atoms

His theory

  • all matter is made up of indivible particles called atoms
  • atoms of the same element are similar in mass and shape but different from the atoms of other elements
  • atoms cannot be created or destroyed
  • atoms join together to form compound atoms (now called molecules) im simple ratios
  • dalton's atomic…

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